A patch that changes colour when it's time to reapply your SPF — and delivers active antioxidants into your skin while you're wearing it. One patch. Two jobs.
When your Solvi patch shifts from sand to terracotta, your UV dose has hit the threshold. Time to reapply. While you were watching the colour — the niacinamide was already working.
Recommended reapplication window
Most people reapply too late — or not at all. Solvi removes the guesswork. When the patch changes, you know. No timers. No forgetting.
"The sticker does the watching. You do the living."
Solvi · Patent Pending · 2026
Two layers. One patch. Everything happening at once — most of it invisibly.
Peel and press onto any exposed area. The hypoallergenic adhesive holds through sun, sweat, and movement. The patch conforms to skin without lifting.
The outer UV-responsive layer absorbs cumulative UV dose. As it reaches the SPF degradation threshold it shifts from sand to terracotta. No app. No phone. Just look.
While you were watching for the colour change, the inner layer was quietly releasing niacinamide into your skin — counteracting UV-induced free radical damage in real time.
What's inside
Counteracts UV-induced free radical generation. Reduces post-sun hyperpigmentation. Works hardest during UV exposure — exactly when Solvi delivers it.
Supports skin barrier function during UV stress. Maintains surface hydration when UV exposure is actively depleting it.
Reduces UV-induced inflammation before it registers as redness. Works at the barrier level — calming the skin during exposure, not just after.
Neutralises free radicals generated by UVA exposure. Works synergistically with niacinamide to protect against photoageing.
Solvi is patent pending and in development. Join the waitlist and be the first to know when it launches. No spam. No noise. Just one email when it's ready.
Patent pending · Trade mark applied for · © 2026 Solvi