SKIN1004 Hyalu-Cica Water-Fit Sun Serum SPF50+: the ultra-light centella sunscreen for oily skin

The Hyalu-Cica naming: centella meets hyaluronic acid

SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum combines "Hyalu" (hyaluronic acid) and "Cica" (centella asiatica) — a pairing that addresses both hydration and calming in a single sunscreen product. The combination is deliberately chosen: centella soothes the skin surface and supports barrier repair, while hyaluronic acid (at multiple molecular weights for surface and deeper hydration) prevents the dehydration that can occur under high-concentration UV filter formulations. Together they create a sunscreen that provides full SPF50+ PA++++ protection while simultaneously improving the skin's hydration and comfort state.

Water-fit texture: what it means for oily skin

The "water-fit" descriptor refers to the product's water-dominant, serum-weight texture. Unlike cream or lotion sunscreens that have an oil phase as a primary component, the Hyalu-Cica Sun Serum uses a water-based formula where the UV filters are suspended in an aqueous medium. This creates a texture that applies with the lightness of a toner-serum, absorbs without an oily residue, and leaves a non-greasy finish on the skin surface. For combination and oily skin types who have historically avoided sunscreen because of the heavy, greasy feeling of conventional SPF products, the water-fit format is the most practical daily solution.

How the Hyalu-Cica Sun Serum fits in a morning routine

SKIN1004 morning sequence: after cleansing and toner, apply SKIN1004 Madagascar Centella Soothing Cream as the hydrating and barrier-supporting step. Once absorbed, apply the Hyalu-Cica Water-Fit Sun Serum as the final product. The serum's water-dominant formula layers cleanly over the cream without disrupting it. On days with outdoor activity or strong sunlight, supplement the morning serum application with the SKIN1004 Hyalu-cica Silky-fit Sun Stick 20g for midday reapplication — the stick format applies cleanly over makeup without disturbing the morning routine's product layer.

The role of multiple molecular weight HA in the formula

Hyaluronic acid in the Hyalu-Cica Sun Serum includes multiple molecular weight variants: high-molecular-weight HA stays on the skin surface, forming a moisture-retaining film. Low-molecular-weight HA penetrates more deeply, attracting water from the dermis to the epidermis. Medium-molecular-weight HA bridges the two depths. This multi-weight HA approach addresses hydration at the surface, mid-epidermis and deeper layers simultaneously — a more comprehensive hydration delivery than a single molecular weight can provide. The combined effect is visibly plumped, evenly hydrated skin that maintains its moisture through a full day of UV filter exposure.

Pairing SKIN1004 sun products with the full centella range

The SKIN1004 product ecosystem extends beyond sun care: the Madagascar Centella Tone Brightening Capsule Ampoule 100ml addresses brightening and tonal evening for skin that also needs UV protection. Morning: soothing cream + Hyalu-Cica Sun Serum. Evening: brightening capsule ampoule + soothing cream. The centella active runs through both morning and evening products, creating a 24-hour centella treatment cycle. The brightening ampoule is applied in the evening (when UV exposure is not a concern) so its active concentration can work undisturbed overnight — a clean role separation that avoids the complexity of active-stacking across the same routine step.