SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum SPF50 PA++++ Guide

SKIN1004 Hyalu-Cica Water-Fit Sun Serum 50ml is priced at USD 17.10 on SKIN1004's official store, checked 2026-10-06, and the question a reader comparing it with Beauty of Joseon's Relief Sun line needs to settle first is texture, not the SPF50+ PA++++ label the two brands print on nearly identical terms. This serum settles that texture question by behaving as a fast-absorbing fluid rather than a cream, so it sits as a watery layer instead of a richer one. SKIN1004, a Korea-based skincare brand built around Madagascar-sourced Centella Asiatica Extract, sells the Hyalu-Cica Water-Fit Sun Serum as the flagship sun-care item in its Hyalu-Cica line, and the sections below check its labeled UV protection, formula focus and finish against the Relief Sun: Rice + Probiotics and Relief Sun Aqua-Fresh: Rice + B5 versions of Beauty of Joseon's sunscreen, using each brand's own product pages and retailer listings.

SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum SPF50+ PA++++

SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum SPF50+ PA++++ (50ml) is priced at USD 17.10 on SKIN1004's official store (checked 2026-10-06), sold alongside 15ml, Twin Pack (50ml x 2) and 100ml Mega Size options on the same storefront, and also listed by retailers such as LookFantastic.

The full ingredient list of Hyalu-Cica Water-Fit Sun Serum has 42 entries; Diethylamino Hydroxybenzoyl Hexyl Benzoate is listed fourth.

The formula centers on Centella Asiatica Extract, which SKIN1004 sources from Madagascar, paired with Sodium Hyaluronate for layered hydration and Niacinamide, in a base the brand lists as alcohol-free and fragrance-free. More on the formula sits on SKIN1004's product information pages.

Its SPF50+ PA++++ label is backed by SKIN1004's own in vivo SPF and PFA/PPD laboratory test records and an in vitro UVA-PF record, and a primary-irritation patch test on the formula returned a clean result across its full test panel, with no reaction logged at any check interval.

For a reader deciding between a serum-light sunscreen finish and a creamier one, Hyalu-Cica Water-Fit Sun Serum settles the choice by applying as a watery, quick-absorbing fluid that retailers including LookFantastic and Cult Beauty describe as leaving no white cast, giving a dewy finish suited to dry, normal and sensitive skin and sitting cleanly under makeup afterward.

• Applies as a water-fit serum that absorbs without a white cast, so it sits under makeup without pilling.
• Pairs SPF50+ PA++++ labeled protection with Centella Asiatica Extract, Sodium Hyaluronate and Niacinamide in an alcohol-free, fragrance-free base.
• Its SPF50+ PA++++ claim is supported by SKIN1004's own in vivo SPF, PFA/PPD and in vitro UVA-PF test records, beyond the label itself.
• Returned a clean primary-irritation patch-test result across its full panel, with no reaction logged at any check point.
• Comes in 15ml, 50ml, Twin Pack and 100ml Mega Size formats, so a reader can trial the smaller size before buying the larger one.

Beauty of Joseon's Relief Sun Aqua-Fresh: Rice + B5, a separate 50ml SPF50+ PA++++ SKU formulated around rice seed water and panthenol as a lighter alternative to the original Relief Sun, is likewise sold only in the single 50ml size, publishes no quantified SPF or PA test report on its own storefront, and draws a recurring pilling-under-makeup complaint logged in a Lyko retailer review and among Hwahae's tallied review tags.

Centella Asiatica Extract and the Hyalu-Cica Complex

Centella Asiatica Extract is the ingredient SKIN1004 sources from Madagascar across its wider Centella and Hyalu-Cica ranges, and the Hyalu-Cica Water-Fit Sun Serum lists it alongside Sodium Hyaluronate in the hyaluronic-acid group the brand uses through that line.

Centella Asiatica, long used in Korean skincare formulas for its soothing reputation, appears here combined with sun filters instead of as a stand-alone treatment step, which is the role the ingredient plays across most modern sunscreen-serum hybrids on the Korean market.

The serum's full ingredient panel, including its chemical UV filter set, is listed on Incidecoder's record for the product, where the filters are catalogued as Diethylamino Hydroxybenzoyl Hexyl Benzoate, Ethylhexyl Triazone, Methylene Bis-Benzotriazolyl Tetramethylbutylphenol, Diethylhexyl Butamido Triazone and Polymethylsilsesquioxane.

Reading SPF50+ PA++++ Labels on a Water-Fit Serum

SPF50+ PA++++ is the two-part protection label printed on this serum's packaging: the SPF number rates UVB screening, while the PA grade, marked in plus signs up to four, rates UVA screening.

UVB and UVA protection claims on Korean-labeled sunscreens are typically measured through separate in vivo SPF and PFA or PPD panel tests and, for UVA-PF specifically, an in vitro method such as ISO 24443; SKIN1004 lists records under each of those categories for this serum, which is the documentation layer behind its SPF50+ PA++++ claim.

Retailers including Cult Beauty and LookFantastic list the same SPF50+ PA++++ rating on their own product pages for this serum, matching the label SKIN1004 prints on the Korean-domestic bottle.

Layering a Serum-Format Sunscreen Under Makeup

A water-fit serum sunscreen is meant to go on after the rest of a skincare routine and before makeup, since its thin, fast-absorbing texture is designed to sit under foundation instead of under heavier creams.

Rubbing a serum sunscreen in and then immediately pressing on a heavy powder before it has absorbed is a common misuse that produces pilling, so letting the serum set for a short moment before makeup avoids disturbing the filter film it leaves on the skin.

Reapplying over finished makeup works better with a dedicated setting-spray or powder sunscreen format than with rubbing in a second layer of the original serum, which is more likely to drag pigment and disturb the base coat already in place.