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No.4 SOS Icy Soothing Sheet Mask Set

No.4 SOS Icy Soothing Sheet Mask Set

Product Description

Product overview

Made in Various INTERNATIONAL

A clinically tested cooling sheet mask infused with real ground mugwort, tea tree extract, and centella asiatica to instantly lower skin temperature by 8°C. Delivers soothing, non-sticky hydration for heated, irritated, and acne-prone skin with a refreshing cooling effect lasting up to 30 minutes.

Clinically Tested Dermatologist Tested No Alcohol No Menthol Cruelty-Free Paraben-Free Silicone-Free Sulfate-Free Real Mugwort Sheet
Pregnancy
Caution
Fungal Acne
Caution
Comedogenic
1/5
Size
4 × 27ml
Type
Sheet Mask
Concern
Soothing
Cooling
−8°C
Duration
30 min
Real reviews · YouTube Shorts
Why it's different

Instant Cooling Effect

Clinically proven to lower skin temperature by 8°C without alcohol or menthol, providing gentle, natural cooling for heated and irritated skin.

01

Texture & feel

SENSORY
Consistency
Watery Essence
Scent
Mild Herbal
Absorption
10–20 min
Finish
Refreshed, Dewy

Instant Cooling Effect

Clinically proven to lower skin temperature by 8°C without alcohol or menthol, providing gentle, natural cooling for heated and irritated skin.

Real Mugwort Sheet

Unique brown-tinted sheet embedded with ground mugwort particles for enhanced soothing and mild textural experience on the skin.

Multi-Botanical Soothing

Packed with tea tree, centella asiatica, licorice root, chamomile, aloe vera, and rosemary extracts for comprehensive calming and anti-inflammatory benefits.

Non-Sticky Hydration

Lightweight serum controls excess oil while deeply hydrating. Absorbs cleanly without leaving a sticky or greasy residue behind.

02

Safety & compatibility

SAFE
Pregnancy & Breastfeeding

Contains tea tree leaf oil, which some dermatologists recommend using with caution during pregnancy. No retinoids, salicylic acid, or hydroquinone present. Consult your doctor before use.

Fungal Acne (Malassezia)

Contains Hydrogenated Lecithin and Laminaria Japonica Extract which may feed malassezia yeast. Those prone to fungal acne should patch test first.

Low Comedogenic Risk

Rated 1/5 on the comedogenic scale. Free from heavy oils and pore-clogging silicones. Suitable for most acne-prone skin types.

Alcohol & Menthol Free

Cooling effect is achieved naturally without drying alcohols or menthol, making it suitable for sensitive and reactive skin.

Dermatologist Tested

Clinically tested formula with results verified for skin temperature reduction and soothing efficacy.

Patch Test Recommended

Contains tea tree oil and multiple botanical extracts. If you have very reactive or eczema-prone skin, patch test on a small area first.

03

Ingredient breakdown

INGREDIENTS

Centella Asiatica ExtractProven

A legendary soothing ingredient used in traditional medicine for centuries. Rich in madecassic acid, asiaticoside, and asiatic acid, centella calms inflammation, accelerates wound healing, and strengthens the skin barrier.

  • Clinical: Multiple studies confirm anti-inflammatory and wound-healing properties
  • Function: Soothes irritation, strengthens skin barrier, provides antioxidant protection
One of the most well-researched calming ingredients in K-beauty. Excellent for post-sun or post-procedure skin.

Melaleuca Alternifolia (Tea Tree) Leaf Extract & Oil ~0.6–0.8%Proven

Tea tree oil is one of the most well-documented natural antimicrobial and anti-acne ingredients. The extract and oil work together to purify and calm blemish-prone skin.

  • Clinical: Tea tree oil at 5% concentration shown to be as effective as 5% benzoyl peroxide for acne in clinical studies
  • Function: Antibacterial, antifungal, anti-inflammatory, and soothing
Tea tree oil can be sensitizing for some individuals. The concentration here is low (~0.6–0.8%), which minimizes irritation risk while still providing benefits.

Panthenol (Pro-Vitamin B5) ~1.9–2.3%Proven

A powerhouse humectant that penetrates deep into the skin to attract and hold moisture. At this concentration, panthenol effectively improves the skin barrier and reduces inflammation.

  • Clinical: Proven to enhance skin barrier function and promote wound healing at concentrations above 1%
  • Function: Deep hydration, barrier repair, and anti-inflammatory support

Adenosine ~1.2–1.4%Proven

A naturally occurring compound involved in many biological processes in skin cells. Known for its anti-aging properties, adenosine can help smooth fine lines and wrinkles while promoting skin recovery.

  • Clinical: High-quality clinical trials demonstrate improvement in deep wrinkles at low concentrations
  • Function: Anti-wrinkle, skin recovery, soothing

Hydrolyzed Hyaluronic Acid ~0.1–0.2%Proven

A low molecular weight form of hyaluronic acid that penetrates deeper into the skin compared to regular HA. Works alongside glycerin, beta-glucan, and fructooligosaccharides to create a multi-layered hydration system.

  • Clinical: Hydrolyzed HA has smaller molecular weight, enabling deeper penetration for enhanced moisturizing
  • Function: Deep hydration, moisture retention, plumping

Glycyrrhiza Glabra (Licorice) ExtractProven

Contains glabridin, a powerful skin-brightening and anti-inflammatory compound. Licorice root helps reduce redness, calm irritation, and even out skin tone over time.

  • Clinical: Glabridin inhibits tyrosinase activity and has documented anti-inflammatory effects
  • Function: Brightening, anti-inflammatory, redness reduction

35 ingredients

Water, Methylpropanediol, Dipropylene Glycol, Melaleuca Alternifolia (Tea Tree) Leaf Extract, Laminaria Japonica Extract, Eclipta Prostrata Leaf Extract, Monarda Didyma Leaf Extract, Cetraria Islandica Extract, Centella Asiatica Extract, Polygonum Cuspidatum Root Extract, Scutellaria Baicalensis Root Extract, Camellia Sinensis Leaf Extract, Ulmus Davidiana Root Extract, Glycyrrhiza Glabra (Licorice) Extract, Aloe Barbadensis Leaf Extract, Viola Mandshurica Flower Extract, Dioscorea Japonica Root Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Chamomilla Recutita (Matricaria) Flower Extract, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Hydrogenated Lecithin, Octyldodeceth-16, Panthenol, Carbomer, Tromethamine, Butylene Glycol, Xanthan Gum, Adenosine, Disodium EDTA, Methyl Diisopropyl Propionamide, Glycerin, Fructooligosaccharides, Beta-Glucan, Hydrolyzed Hyaluronic Acid, 1,2-Hexanediol, Hydroxyacetophenone

FREE FROM: Parabens, Sulfates, Silicones, Alcohol (Ethanol), Menthol, Artificial Fragrances, Mineral Oil, PEGs, Harsh Allergens
04

Where it fits in your routine

ROUTINE
1
Cleanser
2
Toner
3
Sheet Mask
4
Serum
5
Moisturizer
6
Sunscreen

Use after cleansing and toning. Apply the mask for 10–20 minutes, then follow with your remaining skincare steps. Can be used 2–3 times per week or as needed when skin is heated or irritated.

05

How to use

HOW TO USE
1

Cleanse & Tone

Start with a clean face. Apply your toner to refine and prep the skin for better absorption of the mask essence.

2

Unfold & Apply

Carefully remove the mask from the pouch, unfold it, and place the mugwort-infused sheet evenly across your face. Smooth out air bubbles for full contact.

3

Relax for 10–20 Minutes

Leave the mask on for 10–20 minutes to allow the cooling essence to absorb. Enjoy the refreshing sensation as it calms heated skin.

4

Remove & Pat In

Peel off the mask and gently pat any remaining essence into the skin until fully absorbed. No rinsing needed. Follow with serum or moisturizer.

06

Who is it for?

WHO

Perfect for you if:

  • Your skin gets red and irritated after sun exposure or hot weather
  • You have oily or combination skin that needs oil-free hydration
  • You experience acne flare-ups and want a soothing, non-comedogenic mask
  • You want a cooling mask without harsh menthol or alcohol
  • Your skin feels overheated after workouts or physical activity
  • You love the benefits of mugwort and centella for calming inflammation

Consider alternatives if:

  • You need heavy-duty, deep moisturizing (this is lightweight)
  • You are highly allergic to tea tree oil or botanical extracts
  • You prefer a dripping-wet, heavily soaked sheet mask
  • You are looking for an anti-aging focused mask with retinol or peptides
  • You have confirmed fungal acne and react to lecithin or seaweed extracts
07

Skin type compatibility

SKIN TYPES
Oily Skin
Excellent

Lightweight, non-sticky essence absorbs cleanly and helps control excess sebum. Leaves skin refreshed, not greasy.

Dry Skin
Moderate

Provides soothing hydration but may not be moisturizing enough on its own. Follow with a rich cream or sleeping mask for best results.

Combination Skin
Excellent

Balances hydration across different facial zones without clogging T-zone pores or drying cheeks. Ideal match.

Sensitive Skin
Good

Alcohol-free, menthol-free formula is gentle. Contains tea tree oil at low concentrations. Patch test recommended for very reactive skin.

Acne-Prone Skin
Excellent

Low comedogenic rating, tea tree's antimicrobial properties, and non-sticky formula make this ideal for breakout-prone skin.

08

Results timeline

2–4 WEEKS (REGULAR USE)
Immediate

Instant Cooling & Comfort

Skin temperature drops by up to 8°C. Redness visibly reduced and heated skin feels immediately calmed and refreshed.

95% noticed instant cooling
30 Minutes

Sustained Soothing Effect

Cooling sensation continues for up to 30 minutes after application. Skin feels hydrated and balanced with no sticky residue.

88% noticed lasting comfort
After 1 Use

Calmer, Hydrated Complexion

Visible reduction in redness and irritation. Skin appears more even-toned and feels smooth and plump with improved moisture levels.

82% noticed reduced redness
2–4 Weeks (Regular Use)

Improved Skin Resilience

With consistent use 2–3 times per week, skin becomes less reactive to heat and environmental stressors. Overall complexion appears calmer and healthier.

75% noticed improved skin condition
09

Ratings by platform

6K+ REVIEWS
Amazon
4.5
Rating
1,200+
Reviews
Main complaint: Some users expected more intense cooling; the effect is gentle rather than icy
YesStyle
4.7
Rating
350+
Reviews
Main complaint: Packaging change confusion; wish the mask sheet was more saturated with essence
iHerb
4.8
Rating
180+
Reviews
Main complaint: Only 4 sheets per pack; would prefer a larger value set
Olive Young
4.7
Rating
5,000+
Reviews
Main complaint: Mugwort particles can leave residue; wish fit was better for smaller faces
10

Pros & cons

BALANCED

Praised

  • Effective natural cooling without alcohol or menthol
  • Unique real mugwort-embedded sheet for enhanced soothing
  • Non-sticky, lightweight essence that absorbs cleanly
  • Clinically tested for 8°C skin temperature reduction
  • Great ingredient list with centella, tea tree, and licorice
  • Perfect for post-sun, post-workout, or summer use
  • No parabens, sulfates, silicones, or harsh alcohols

Criticized

  • Cooling effect is subtle—not as intense as the "-4°C" branding suggests
  • Sheet is not as drenched in essence compared to some competitors
  • Only 4 sheets per pack feels like limited value
  • Mugwort particles can leave minor residue on skin
  • Not hydrating enough for very dry skin types
  • Mask fit may not suit all face shapes
11

Budget-friendly alternatives (dupes)

DUPES
82% Match
Mediheal Tea Tree Care Solution Essential Mask EX
$2.00/sheet
Budget Pick
75% Match
Heartleaf 77% Soothing Sheet Mask
$3.00/sheet
Similar Price
12

Comparison with competitors

SIDE-BY-SIDE
Centella Asiatica Calming Mask
Key Ingredients Centella 15% + Triple HA + Niacinamide
Cooling Effect No cooling technology
Sheet Type Standard cotton
Alcohol/Menthol Free
Pack Size 10 sheets
Best For General calming and hydration on a budget
Mugwort Mask
Key Ingredients Mugwort Extract (Ganghwa)
Cooling Effect No cooling technology
Sheet Type Standard essence-soaked
Alcohol/Menthol Free
Pack Size 5 sheets
Best For Mugwort purists, redness and sensitivity

Mediheal Tea Tree Care Solution Essential Mask EX

Key Ingredients Tea Tree Oil + Pine Needle Extract
Cooling Effect No cooling technology
Sheet Type Standard cellulose
Alcohol/Menthol Free
Pack Size 10 sheets
Best For Budget-friendly acne and blemish care
13

Storage & shelf life

24 MONTHS
Period After Opening (PAO)

Use immediately after opening each individually sealed pouch. Unopened shelf life: 24 months from manufacture date.

Storage

Store in a cool, dry place away from direct sunlight. Refrigerate before use for an enhanced cooling experience.

Packaging

Individually sealed foil pouches (4 sheets per box), each containing 27ml of essence. Mugwort-embedded sheet material.

Travel Friendly

Yes — individually packaged, lightweight, and TSA-compliant. Perfect for travel or on-the-go soothing.

13

Frequently asked questions

FAQ

Use with caution. This mask contains tea tree leaf oil, which some healthcare providers advise limiting during pregnancy. There are no retinoids, salicylic acid, hydroquinone, or chemical sunscreens in the formula, which is positive. However, we always recommend consulting your OB-GYN or dermatologist before introducing any new skincare product during pregnancy or breastfeeding.

Use with caution. The formula contains Hydrogenated Lecithin and Laminaria Japonica Extract, which may potentially feed malassezia yeast in susceptible individuals. If you have confirmed fungal acne, patch test first or consult a dermatologist. Most users with occasional breakouts report no issues.

Yes, this mask works well as a soothing step after using actives like retinol, vitamin C, AHA, or BHA. Its calming ingredients (centella, aloe, chamomile) can help reduce irritation caused by strong actives. Use the mask on nights when your skin needs extra calming, or as a recovery step after exfoliation. Avoid using it immediately on freshly acid-treated skin if you notice any stinging.

This mask is best suited for oily, combination, and acne-prone skin types due to its lightweight, non-sticky formula with sebum-controlling properties. It also works well for sensitive skin thanks to its alcohol-free and menthol-free formulation. Dry skin types may find it too lightweight and should follow up with a richer moisturizer.

The cooling and soothing effects are immediate — you will feel the temperature drop and calming sensation within seconds of application. Visible redness reduction occurs within 10–20 minutes of wear. For improved overall skin resilience and reduced reactivity, consistent use 2–3 times per week for 2–4 weeks is recommended.

Apply after cleansing and toning (Step 3 in your routine). After removing the mask, pat in the remaining essence, then continue with your serum, moisturizer, and sunscreen (if daytime). This mask can be used in both AM and PM routines, though it is most popular as an evening or post-sun treatment.

This mask has a low comedogenic rating of 1 out of 5. It is free from heavy oils, silicones, and common pore-clogging ingredients. The lightweight, watery essence absorbs cleanly and is unlikely to cause breakouts. It is well-suited for acne-prone and oily skin types.

Each sheet mask is individually sealed and should be used immediately after opening the pouch. Do not save an opened mask for later use. The unopened product has a shelf life of approximately 24 months from the date of manufacture. Check the expiration date printed on the packaging.

— Skincarisma verdict
4.3 / 5 ★★★★☆

Verdict: The numbuzin No.4 SOS Icy Soothing Sheet Mask is an excellent choice for anyone dealing with heated, irritated, or acne-prone skin. Its clinically tested cooling technology, real mugwort-embedded sheet, and botanical-rich essence set it apart from standard soothing masks. While the cooling effect is gentler than the dramatic branding suggests, it delivers genuine calming and hydration without alcohol or menthol. Best suited for oily, combination, and sensitive skin types looking for post-sun or post-workout relief. The only real drawbacks are the light essence saturation and only 4 sheets per box. Overall, a standout K-beauty sheet mask that earns its cult following.

Product Overview

question
lightbulb What are Quick Product Notes?

Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.

muscle Pro Tip Alert!

Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.

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Quick Product Notes

Click on icons for more information
question
lightbulb What are Notable Effects & Ingredients?

Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.

We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.

muscle Pro Tip Alert!

Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.

Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you

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Notable Effects & Ingredients

anti-aging Anti-Aging from 5 ingredient(s):
Adenosine Centella Asiatica Extract Beta-Glucan Camellia Sinensis Leaf Extract Hydrolyzed Hyaluronic Acid
brightening Brightening from 2 ingredient(s):
Glycerin Hydrolyzed Hyaluronic Acid
wound Promotes Wound Healing from 5 ingredient(s):
Panthenol Glycerin Adenosine Centella Asiatica Extract Hydrolyzed Hyaluronic Acid
question
lightbulb What are Ingredients Related to Skin Type?

Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.

We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.

muscle Pro Tip Alert!

A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.

One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!

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Ingredients Related to Skin Types

Click on icons for more information
dry-skin Dry Skin
4
oily-skin Oily/Acne-Prone Skin
sensitive-skin Sensitive Skin
question
lightbulb What is the Ingredient Safety Breakdown?

Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.

muscle Pro Tip Alert!

EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.

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Ingredient Safety Breakdown

EWG Health Ratings
Low risk
Medium risk
High risk
Unknown risk
47% 52%

Product ingredient list

Showing first 5 of 36 ingredients
EWG CIR Ingredient Name & Cosmetic Functions Notes
1 Unknown
Water
Solvent, Skin Conditioning
1 Unknown
Methylpropanediol
Solvent
1 A
Dipropylene Glycol
Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling
1 A
1,2-Hexanediol
Solvent, Skin Conditioning
Hydrating
0 Unknown
Hydroxyacetophenone
Irritation
VIEW ALL INGREDIENTS