Round Lab Birch Juice Moisturizing UV Lock Sun Cushion
- Sunscreen
- SPF 50
- 0.5 fl oz
- All
A portable, fragrance free SPF50+ cushion built for reapplication over makeup, with birch juice water for a cooling feel.
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How it ranks among the 132 sunscreens we track
4.1★ across 201 Amazon ratings, Bayesian-smoothed toward the category average.
201 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
50+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 132 sunscreens we track - how the scorecard works · full sunscreens data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
Round Lab's Birch Juice Sun Cushion is a Korean SPF50+ sunscreen in a compact cushion format, sized around 0.52 to 0.53 fluid ounces and built for reapplying over makeup.
The cushion form factor sets it apart from standard sunscreen lotions, letting it be pressed on top of makeup during the day without disturbing a finished look, while the birch juice water base is described as cooling and soothing. Manufactured by COSMAX and ranked 261 in facial sunscreens, it lists ecamsule and hyaluronic acid among its active ingredients.
- SPF50+ sun cushion
- 0.52 to 0.53 fl oz size
- Ecamsule and hyaluronic acid
- Fragrance free, paraben free
Who it's for
Suits people who want to reapply sun protection over makeup during the day without carrying a separate sunscreen stick or spray. Not the right pick for anyone who prefers a traditional lotion sunscreen applied by hand.
Strengths and trade-offs
Drawn from this product's published specifications.
- SPF50+ broad spectrum protection
- Cushion format reapplies easily over makeup
- Fragrance free and paraben free
- Birch juice water for a cooling feel
- Not water resistant
- Small 15 gram or 0.53 fl oz fill
Performance notes
Ecamsule is a UV filter used to extend broad spectrum coverage, paired here with hyaluronic acid for hydration as the cushion is pressed onto skin. The listing notes it is not water resistant, so reapplication after swimming or heavy sweating would need a fresh layer regardless of the cushion format.
Specifications
| Brand | Round LAB |
|---|---|
| Model | RU02G0021 |
| Dimensions & fit | |
| Item Weight | 0.5 ounces |
| Item Dimensions | 3 × 3 × 2.5 inches |
| Package Size Name | 15g |
| Capacity & performance | |
| Item Volume | 0.5 fl oz |
| Age Range Description | Baby |
| Construction & materials | |
| Material Features | Fragrance Free |
| Material Type Free | Paraben Free |
| Other details | |
| Sun Protection Factor | SPF 50 |
| Skin Type | All |
| Number Of Items | 1 |
| Skin Tone | All |
| Manufacturer | COSMAX |
| Scent Name | Unscented |
| Additional Features | Sun Cushion form factor, Birch Juice Water, Cooling Effect |
| Asin | B0F6CRVKSZ |
| Best Sellers Rank | #26,775 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #261 in Facial Sunscreens #3,214 in Facial Skin Care Products |
| Recommended Uses For Product | Daily Protection, Moisturizing, Sun Protection, Travel |
| Customer Reviews | {'ratings_count': '201', 'stars': '4.1'} |
| Target Use Body Part | Face |
| Manufacturer Part Number | RU02G0021 |
| Product Benefits | Soothing |
| Item Form | Lotion |
| Active Ingredients | Ecamsule, hyaluronic_acid |
| Water Resistance Level | Not Water Resistant |
Other Round LAB sunscreens
How it compares
This product against the closest alternatives we track in sunscreens.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Round Lab Birch Juice Moisturizing UV Lock Sun CushionThis product | 4.1 / 5 | 201 | 3.7 / 5 |
| mixsoon Centella Hyal Sunscreen 50mlmixsoon | 4.6 / 5 | 3,000 | 4.5 / 5 |
| Sun Bum SPF 50 Face Cream Sunscreen with Zinc OxideSun Bum | 4.7 / 5 | 7,900 | 4.3 / 5 |
| Eucerin Sun Age Defense SPF 50 Face Sunscreen Lotion with Hyaluronic AcidEucerin | 4.7 / 5 | 4,600 | 4.3 / 5 |
| IMAGE Skincare PREVENTION+ Daily Ultimate Protection MoisturizerIMAGE Skincare | 4.6 / 5 | 3,200 | 4.2 / 5 |
Similar sunscreens from other brands
Questions about the Round LAB RU02G0021
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What SPF does the Round Lab Sun Cushion provide?
SPF50+ broad spectrum.
Can this sunscreen be applied over makeup?
Yes, it is designed as a cushion for reapplying over makeup.
Is the Round Lab Sun Cushion water resistant?
No, it is listed as not water resistant.