The science
The pad's formula rests on a hydration architecture that has some real evidence behind it and a cooling mechanism that has almost none as a skin benefit. The hydration first. A 2025 review in Biomolecules on topical hyaluronic acid concluded that fractions below roughly 100 kDa penetrate skin, with the lowest molecular weights reaching deepest, while larger forms and crosspolymers remain at the surface as a water-holding film. That is the logic of pairing sodium hyaluronate in sixth place with hydrolyzed and free hyaluronic acid higher up and a run of hydrolyzed, acetylated, potassium and silanol hyaluronates at the tail — a spread of sizes that hydrates at more than one depth. A 2024 double-blind randomized trial in Archives of Dermatological Research on 36 elderly patients with dry skin found a low-molecular-weight hyaluronic acid lotion raised skin capacitance significantly more than a high-molecular-weight version or vehicle over four weeks, with no difference in adverse effects, which supports the inclusion of the hydrolyzed fractions rather than a single large polymer. Because the pad is a leave-on, the humectant base of propanediol, butylene glycol and glycerin and the small ceramide-cholesterol-phytosphingosine set at the end also stay put, which is more than the same ingredients achieve in the line's rinse-off cleansers.
The calming layer — heartleaf fifth in the list, centella, purslane, licorice-root dipotassium glycyrrhizate, panthenol, allantoin — draws on botanicals with modest laboratory records for anti-inflammatory activity and a long history of tolerability in Korean formulation; none has strong clinical trial evidence in a cosmetic at these doses, but the combination is sensible for skin flushed by heat.
The cooling is a different kind of claim. Hinoki and eucalyptus oils act on cold-sensing nerve receptors, producing the sensation of a temperature drop without materially changing skin temperature; that provides comfort and can discourage rubbing, but it is not anti-inflammatory action. A 2021 review in the International Journal of Women's Dermatology summarised the growing case literature on allergic contact dermatitis from essential oils and recommended that clinicians ask about them routinely, and eucalyptus oil is among those regularly implicated. In a product for sensitive skin, that places the two oils as the formula's one evidence-based reservation.
References 3 ShowHide
- Hyaluronic Acid in Topical Applications: The Various Forms and Biological Effects of a Hero Molecule in the Cosmetics Industry — Biomolecules (2025)
- Effectiveness of topical hyaluronic acid of different molecular weights in xerosis cutis treatment in elderly: a double-blind, randomized controlled trial — Archives of Dermatological Research (2024)
- Art of Prevention: Essential Oils - Natural Products Not Necessarily Safe — International Journal of Women's Dermatology (2021)