iS Clinical Hydra-Cool Serum
The Verdict
Hydra-Cool Serum is a solid, low-risk hydrating layer for anyone whose skin is sensitised, dehydrated or recovering from a treatment — it's built around humectants and calming botanicals rather than actives, so there's little to go wrong with regular use. It won't replace a treatment serum and it isn't a substitute for your practitioner's specific aftercare instructions, but as a calming, cooling step to sit alongside those products, it does what it says on the tin.
iS Clinical Hydra-Cool Serum | Hydrating Face Serum | 15ml & 30ml
£64.00
What is iS Clinical Hydra-Cool Serum?
iS Clinical Hydra-Cool Serum is a lightweight, water-based hydrating serum built around hyaluronic acid, Centella Asiatica and vitamin B5, with an instant cooling sensation on application. It's designed for dehydrated, sensitive, or freshly-treated skin — including post-procedure, post-sun, and post-shave use — where a calming, non-greasy layer of moisture is needed most.
The formula is built around humectants and calming botanicals rather than active exfoliants or treatment ingredients, which is why iS Clinical positions it as a soothing, hydrating step rather than a daily active serum. It's sold in 15ml and 30ml sizes.
Key ingredients
- Hyaluronic Acid (Sodium Hyaluronate) — a humectant that draws and holds moisture at the skin's surface.
- Centella Asiatica — a botanical extract commonly used to help calm and soothe stressed or reactive-looking skin.
- Vitamin B5 (Panthenol) — supports the skin's moisture barrier and is widely used in soothing formulas.
- Mushroom extract — included for its antioxidant properties.
- A light menthol cooling effect — iS Clinical's own product description attributes the serum's instant cooling sensation to this ingredient.
Who it's suited to
Hydra-Cool Serum is aimed at anyone whose skin needs calming, hydrating support rather than active treatment, including:
- Dehydrated, tight or dull-feeling skin
- Sensitive or reactive-prone skin, including rosacea-prone skin
- Skin that's recently had a professional treatment or procedure, used as advised by your practitioner
- Sun-exposed or post-shave skin that needs an immediate cooling layer
- Anyone travelling, where cabin air can leave skin feeling parched
Because it's a calming, hydrating layer rather than an exfoliating or brightening treatment, it's designed to sit alongside — not replace — an active serum, such as a vitamin C or retinoid product, where your skin can tolerate one.
Texture and finish
The serum has a fluid, water-based texture that spreads easily and sinks in within moments, leaving no tackiness or greasy after-feel. The cooling sensation on application is immediate but temporary — most people find it fades within a minute or two, once the serum has absorbed.
How to use it
Apply a small amount to cleansed skin, morning and/or evening, before heavier creams or SPF. The lightweight, fast-absorbing texture layers well under makeup, and some people also use it as an instant cooling top-up during the day on flushed or overheated skin.
What it won't do
Hydra-Cool Serum is a hydrating and calming formula, not a treatment serum — it isn't formulated to exfoliate, brighten pigmentation, or deliver the kind of active ingredient concentrations found in iS Clinical's treatment-led serums. If you're looking for something that helps improve the appearance of pigmentation, fine lines, or breakouts, this isn't that step; it's the layer that supports and calms the skin around those treatments.
Who might want a different product
If your priority is an active treatment ingredient — for example targeting pigmentation, fine lines, or breakouts — Hydra-Cool Serum isn't built for that job, and a treatment-led serum elsewhere in the iS Clinical range would be a better fit. It's also not a sunscreen or a standalone barrier-repair balm; pair it with SPF by day and, for very compromised or very dry skin, with a richer balm such as Sheald Recovery Balm.
Pregnancy and breastfeeding
If you're pregnant or breastfeeding, please contact our team for advice before use.
Where it fits in an iS Clinical routine
Hydra-Cool Serum pairs naturally with Poly-Vitamin Serum for those who want a gentler, non-active routine, and with Sheald Recovery Balm as a richer, more occlusive layer for very dry or compromised skin. For a full breakdown of which iS Clinical products suit sensitive or freshly treated skin, see our guide to the best iS Clinical products for sensitive and post-procedure skin, or browse the full iS Clinical range on Skintique Academy.
The key humectant here, hyaluronic acid, is used across many hydrating formulas — see our hyaluronic acid glossary entry for more on how it works.