PRODUCT REVIEW

ROUND LAB Birch Juice Sun Cushion

A zinc oxide sunscreen in a cushion compact, made for reapplying over makeup. Unlike much of the K-beauty sun market, this one is sold here by the brand itself.

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ROUND LAB Birch Juice Sun Cushion

Key facts

ROUND LAB Birch Juice Sun Cushion at a glance.

Zinc oxide 22% (SPF 50+)

Key active

SPF 50+ cushion compact

Texture

Reapplying sun protection over makeup; dry to normal skin

Best for

$24–30

Approximate price

Fragrance free

Fragrance

0.52 oz

Size

$26.99

Price

Sunscreen

Type

What is it?

Top things to know about ROUND LAB Birch Juice Sun Cushion

  1. ROUND LAB Birch Juice Sun Cushion is an SPF 50+ mineral sunscreen in a cushion compact — a sponge soaked with product and a puff to press it on. It holds 15 g, small for something you use through the day. This is a top-up sunscreen, not your morning application.
  2. The filter is zinc oxide at 22%, a mineral that sits on the surface and scatters ultraviolet light away. Birch juice, aloe and hyaluronic acid sit further down the list. There is no fragrance. It presses on as a thin, slightly tinted film that evens tone a little.
Mixed

A cushion is the right format for reapplying over makeup, because it presses a real film of zinc onto skin where a powder only dusts on a fraction. It still goes on thinner than a lotion, and the compact holds very little. Use a proper sunscreen in the morning and this at midday.

— Dr. Schwarz

Skin fit

Is it right for your skin?

Sun Damage

UVA reaches the lower layer of skin and breaks down the collagen there, all day, not only at noon. Sunscreen wears, rubs and sweats off within a couple of hours, so the second application matters as much as the first. This compact makes that possible over makeup in about ten seconds.

Good fit

Sensitive Skin

Zinc oxide stays on the surface rather than absorbing, so less is in contact with living skin than a chemical filter. This one is zinc only and fragrance-free.

Good fit

Dry Skin

A cushion presses product on instead of dragging it across the skin, which is easier on dry, flaky patches than rubbing in a lotion. It does not dry down matte, so it does not cling to flakes.

Texture

What it feels like on skin.

Cream

The product in the sponge is a cream, thicker than a fluid sunscreen. It leaves a faint brightening tint rather than a foundation shade, which reads as evened tone on light and medium skin. On deeper skin tones a zinc formula can still cast, and no-cast claims are usually tested on lighter skin, so treat that as unverified. It is fragrance-free. The compact holds 15 g, which runs out faster than it looks.

Alternatives

If this isn’t the right product for you

Recommended more

EltaMD UV Clear

A lotion is the better morning layer, since a compact goes on thinner. Oil-free and fragrance-free with 5% niacinamide.

Recommended equally

Cetaphil Mineral Stick

Another fragrance-free mineral top-up, and the right tool for ears, nose and hairline. Not your only sunscreen either.

Recommended less

Supergoop! (Re)setting Powder

A zinc powder for touching up over makeup. Studies find people brush on about a tenth of the tested thickness, so it delivers well under the label.

Ingredients · Interactive

What’s in it, and where each ingredient works.

Full ingredient list · 37 ingredients, in label order. Click one.

Active ingredients: Zinc Oxide 22% Inactive ingredients: WaterButyloctyl SalicylateCaprytyl MethiconeMethyl TrimethiconeEthylhexyl IsononanoateButylene Glycol Dicaprylate/DicapratePro-panecioPolyglypery -4 Disostearate/Polyhydroxystearate/SebacateEthylhexyl MethoxycryleneAlcohol Denat.Methyl Methacrylate Cross-polymerPolyglycery -6 PolyricinoleateTriethoxycaprylyisilaneMagnesium Sulfate1,2- HexanediolDistearimonium HectoritePolyglyceryl-6 PolyhydroxystearateHydroxy-acetophenoneArtemisia Annua ExtractPolyglyperin-6Pinus Sylvestris Leaf OilAnthemis Nobils Flower OilDipotassium GlycyrrhizateAllantoinGlyceryl GlucasideButyiene Glycol GlycerinAscorbyl PalmitateBetula Platyphylla Japonica JuiceUmus Davidiana Root ExtractAloe Barbadensis Leaf ExtractDioscorea Japonica Root ExtractViola Mandshurica Flower ExtractLaminaria Japonica ExtractGlyceryl CaprylateSodium Hyaluronate Hyaluronic AcidAscorbic Acid
Keeps the product working

  1. Vitamin E, an antioxidant. Here it mainly keeps the oils in the product from going rancid.

What it does
Where it worksSurface
SurfaceBarrierEpidermisDermis

How to use it

How to use it.

Every day

How to apply it

  1. How muchPress an even layer over the whole face. A compact goes on thinner than a lotion, so go around twice.
  2. WhereThe nose, cheekbones and forehead, the parts that face the sun.
  3. ReapplyEvery two hours outdoors, and after sweating or swimming.
Over time

What to expect

  1. What to expectA slight evening of tone, and nothing else. Sun protection is preventive, so the result is what does not happen. This is not your only sunscreen.

Questions

Common questions.

Is ROUND LAB Birch Juice Sun Cushion mineral or chemical?

Mineral. Zinc oxide only.

Can I use ROUND LAB Birch Juice Sun Cushion as my only sunscreen?

No. Use a lotion in the morning and this to reapply.

Is ROUND LAB Birch Juice Sun Cushion better than a powder?

Yes. A cushion deposits more product.

Can I reapply ROUND LAB Birch Juice Sun Cushion over makeup?

Yes. That is its main use.

Is ROUND LAB Birch Juice Sun Cushion fragrance-free?

Yes.

What SPF is ROUND LAB Birch Juice Sun Cushion?

SPF 50+.

References

Sources.

  1. 1. Sunscreen Drug Products for Over-the-Counter Human Use (Proposed Rule) (https://www.federalregister.gov/documents/2019/02/26/2019-03019/sunscreen-drug-products-for-over-the-counter-human-use) — FDA proposes zinc oxide (and titanium dioxide) as GRASE (Category I) mineral UV filters at concentrations up to 25%, supporting the safety and effectiveness of the product's zinc oxide 22% mineral-only formula. Link
  2. 2. ROUND LAB BIRCH JUICE MOISTURIZING UVLOCK SUN CUSHION - zinc oxide sponge (Drug Label) (https://fda.report/DailyMed/26407b83-b417-6450-e063-6294a90ad2b1) — The official OTC drug facts label confirms the exact active ingredient formulation: Zinc Oxide 22%, broad spectrum SPF 50+. Link
  3. 3. Birch Moisturizing Sun Cushion SPF 50+, PA++++ / Round Lab (https://roundlab.com/products/birch-moisturizing-sun-cushion) — Round Lab sells the cushion directly in the US with fast shipping from a US warehouse, confirming the page's US-warehouse and direct-sale claim. Link
  4. 4. ROUND LAB Birch Juice Moisturizing Sun Cushion 0.52 oz.(15g) / OLIVE YOUNG US (https://us.oliveyoung.com/products/UA87927457) — A major retailer listing confirms US availability and the mineral zinc oxide active (listed as Zinc Oxide 22.28%) of the cushion. Link
  5. 5. Does Powder Sunscreen Actually Work? / Cleveland Clinic (https://health.clevelandclinic.org/powder-sunscreen) — A dermatologist explains that a light dusting of powder sunscreen is not a protective layer — a thick layer is needed to reach adequate protection and people rarely apply enough — supporting the claim that powder is the weakest reapplication format. Link
  6. 6. Photoprotection according to skin phototype and dermatoses: practical recommendations from an expert panel (https://pmc.ncbi.nlm.nih.gov/articles/PMC8252523/) — Expert-panel recommendations stress that applying an adequate quantity of sunscreen (the ~2 mg/cm2 target) and reapplying are essential for real protection, supporting the page's emphasis on reapplication and depositing real product. Link