The short version
The short version of this review
COSRX Ultra-Light Invisible Sunscreen SPF50 PA++++ is a sheer Korean fluid sunscreen built on 66% aloe leaf water with niacinamide, using drometrizole trisiloxane, ethylhexyl triazone, Uvinul A Plus and terephthalylidene dicamphor sulfonic acid. It launched in the UK in May 2024. This is desk research, not a hands-on test.
Product information reviewed 2026-09-25.
01 / The basics
What is Ultra-Light Invisible Sunscreen SPF50 PA++++?
COSRX describes a sheer, fast-absorbing SPF50 PA++++ sunscreen built on 66% aloe leaf water with niacinamide and vitamin E; the UK listing names drometrizole trisiloxane, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate and terephthalylidene dicamphor sulfonic acid as filters, and no artificial fragrance is added.
- Best for
- A transparent daily SPF on bare skin or under tint
02 / Review
What is in Ultra-Light Invisible Sunscreen SPF50 PA++++?
COSRX builds this SPF50 PA++++ sunscreen on aloe leaf water — 66% of the formula — with witch hazel water, niacinamide and hyaluronic acid. Its filters include two Mexoryl filters (XL and SX), ethylhexyl triazone and Uvinul A Plus, a combination permitted in the UK and EU.
The brand describes a sheer, fast-absorbing, non-greasy texture designed to stay invisible on all skin tones. That is a manufacturer description; The Cast Index has not tested protection or wear.
03 / Review
Who is Ultra-Light Invisible Sunscreen SPF50 PA++++ best for?
Oily and combination skin, or anyone who wants a very light fluid under skin tint or foundation rather than a cream.
04 / Review
What should you check before buying?
UK high-street stock was patchy when checked, so confirm availability and the exact name before ordering. Witch hazel water is in the formula, which some sensitive skins avoid. No water resistance is claimed; reapply after swimming, sweating or towelling.
05 / How to use it
How should you use Ultra-Light Invisible Sunscreen SPF50 PA++++?
- 01Apply as the final step of morning skincare, before makeup
- 02Use enough to cover face, neck and ears evenly
- 03Reapply at least every two hours outdoors, and after swimming, sweating or towelling
- 04Remove at night with your usual cleanser
06 / Quick facts
What should you know before choosing Ultra-Light Invisible Sunscreen SPF50 PA++++?
- —SPF50 PA++++ fluid sunscreen, 50ml
- —66% aloe leaf water, witch hazel water, niacinamide, sodium hyaluronate, allantoin and vitamin E
- —UV filters on the UK listing: drometrizole trisiloxane (Mexoryl XL), ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate and terephthalylidene dicamphor sulfonic acid (Mexoryl SX)
- —No artificial fragrance and no ethanol, per the brand and UK listing
- —UK launch announced in May 2024; no water resistance claimed
- —No UK guide price recorded: retailer stock was limited when checked on 25 September 2026