# SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum

> SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum is an SPF50+ PA++++ serum sunscreen using Uvinul A Plus, ethylhexyl triazone, Tinosorb M and diethylhexyl butamido triazone, with centella and hyaluronic acid. UK retailers listed it at £16–£19 for 50ml on 25 September 2026. This is desk research from published specifications, not a hands-on test.

- Canonical: https://thecastindex.com/beauty/skin1004-madagascar-centella-hyalu-cica-water-fit-sun-serum
- Category: SPF
- Format: SPF50+ PA++++ serum sunscreen
- Finish: Dewy, no white cast
- Best for: A lightweight daily SPF layer under makeup
- Official: https://www.skin1004.com/products/hyalu-cica-water-fit-sun-serum-spf50-pa?country=GB
- Reviewed: 2026-09-25
- Method: evidence-led desk review of official specifications — not an implied hands-on test

## Should you buy this?

A serum-texture SPF50+ PA++++ with modern UK/EU filters, centella and hyaluronic acid, at around £18. Choose it when a cream sunscreen feels heavy under makeup. It is not water resistant, and the US “Sun Serum UV” is a different formula.

Skip this if you need a water-resistant sunscreen for swimming or sport, a mineral-only formula, or a matte finish on very oily skin.

A serum-weight protect step with a dewy surface for base to sit on — sun protection that should not show up in the photograph.

## The formula

SKIN1004’s Hyalu-Cica Water-Fit Sun Serum is a chemical sunscreen in a serum texture, labelled SPF50+ PA++++. The filters named on UK retailer listings — Uvinul A Plus, ethylhexyl triazone, Tinosorb M and diethylhexyl butamido triazone — are modern filters permitted in the UK and EU but not in US sunscreens. Around them sit Madagascar centella asiatica extract, hyaluronic acid and niacinamide.

The brand and retailers describe a light, dewy finish with no white cast. Those are manufacturer descriptions of texture; The Cast Index has not tested SPF, UVA protection or wear.

## Who it’s for

Readers who find cream sunscreens heavy under makeup and want a protect step that behaves more like a serum. The dewy finish suits normal to dry skin, or sits well under a matte base; very oily skin may want to set the centre of the face.

## What should you check before buying?

Check the name: the international Water-Fit Sun Serum and the US Sun Serum UV share branding but not filters. There is no UK brand shop — the global store prices in US dollars and the buyer pays import charges — so authorised UK retailers are the simpler route. No water resistance is claimed; reapply after swimming, sweating or towelling.

## How to use it

1. Apply as the last step of morning skincare, before makeup
2. Use enough to cover face, neck and ears evenly — a thin layer gives less protection than the label states
3. Reapply at least every two hours outdoors, and after swimming, sweating or towelling
4. Remove at night with your usual cleanser

## Questions and answers

### Is SKIN1004 Hyalu-Cica Water-Fit Sun Serum a mineral sunscreen?

No. The UK listing names four chemical UV filters — Uvinul A Plus, ethylhexyl triazone, Tinosorb M and diethylhexyl butamido triazone — and no zinc oxide or titanium dioxide.

### Is SKIN1004 Hyalu-Cica Water-Fit Sun Serum water resistant?

No water resistance is claimed. Reapply after swimming, sweating or towelling, and choose a water-resistant sunscreen for swimming or sport.

### Is the US SKIN1004 sun serum the same formula?

No. SKIN1004 sells a US “Sun Serum UV” SPF 50 with avobenzone, homosalate, octisalate and octocrylene. The SPF50+ PA++++ formula sold by UK retailers uses different filters.

## Explore the category

https://thecastindex.com/beauty/category/spf