No.4 SOS Icy Soothing Sheet Mask Set
No.4 SOS Icy Soothing Sheet Mask Set
Product Description
Product overview
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.
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.
Texture & feel
SENSORYInstant 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.
Safety & compatibility
SAFEContains 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.
Contains Hydrogenated Lecithin and Laminaria Japonica Extract which may feed malassezia yeast. Those prone to fungal acne should patch test first.
Rated 1/5 on the comedogenic scale. Free from heavy oils and pore-clogging silicones. Suitable for most acne-prone skin types.
Cooling effect is achieved naturally without drying alcohols or menthol, making it suitable for sensitive and reactive skin.
Clinically tested formula with results verified for skin temperature reduction and soothing efficacy.
Contains tea tree oil and multiple botanical extracts. If you have very reactive or eczema-prone skin, patch test on a small area first.
Ingredient breakdown
INGREDIENTSCentella 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
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
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
Where it fits in your routine
ROUTINEUse 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.
How to use
HOW TO USECleanse & Tone
Start with a clean face. Apply your toner to refine and prep the skin for better absorption of the mask essence.
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.
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.
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.
Who is it for?
WHOPerfect 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
Skin type compatibility
SKIN TYPESLightweight, non-sticky essence absorbs cleanly and helps control excess sebum. Leaves skin refreshed, not greasy.
Provides soothing hydration but may not be moisturizing enough on its own. Follow with a rich cream or sleeping mask for best results.
Balances hydration across different facial zones without clogging T-zone pores or drying cheeks. Ideal match.
Alcohol-free, menthol-free formula is gentle. Contains tea tree oil at low concentrations. Patch test recommended for very reactive skin.
Low comedogenic rating, tea tree's antimicrobial properties, and non-sticky formula make this ideal for breakout-prone skin.
Results timeline
2–4 WEEKS (REGULAR USE)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 coolingSustained Soothing Effect
Cooling sensation continues for up to 30 minutes after application. Skin feels hydrated and balanced with no sticky residue.
88% noticed lasting comfortCalmer, 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 rednessImproved 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 conditionRatings by platform
6K+ REVIEWSPros & cons
BALANCEDPraised
- 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
Budget-friendly alternatives (dupes)
DUPESComparison with competitors
SIDE-BY-SIDEMediheal Tea Tree Care Solution Essential Mask EX
Storage & shelf life
24 MONTHSUse immediately after opening each individually sealed pouch. Unopened shelf life: 24 months from manufacture date.
Store in a cool, dry place away from direct sunlight. Refrigerate before use for an enhanced cooling experience.
Individually sealed foil pouches (4 sheets per box), each containing 27ml of essence. Mugwort-embedded sheet material.
Yes — individually packaged, lightweight, and TSA-compliant. Perfect for travel or on-the-go soothing.
Frequently asked questions
FAQUse 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.
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
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.
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.
Quick Product Notes
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.
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
Notable Effects & Ingredients
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.
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!
Ingredients Related to Skin Types
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.
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.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Water
Solvent, Skin Conditioning
|
|
|
| 1 |
Methylpropanediol
Solvent
|
|
|
| 1 |
Dipropylene Glycol
Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling
|
|
|
| 1 |
1,2-Hexanediol
Solvent, Skin Conditioning
|
Hydrating
|
|
| 0 |
Hydroxyacetophenone
|
Irritation
|






