Urea
AMA humectant that also gently softens built-up, thickened skin — relied on by dermatology for rough, dry patches for decades.
Booty Skincare
Same routine, split by the clock — smoothing hydration in the morning, focused resurfacing at night.

PM — Firming treatment
Focused resurfacing overnight: a retinoid prompts skin to rebuild collagen while centella keeps the routine comfortable enough to keep up.
Or take both together in the Complete Routine below.

The actives
A humectant that also gently softens built-up, thickened skin — relied on by dermatology for rough, dry patches for decades.
Supports the skin barrier and works on tone and texture evenness without disrupting a retinoid routine at night.
The most studied ingredient for prompting skin to rebuild collagen — the mechanism behind firmer, less crepey skin over time.
Calms skin while it adjusts to a retinoid, so the routine stays comfortable enough to actually keep up.
How to use it
The proof
Most firming creams stop at the ingredient: a study on 5% caffeine, cited on a bottle that contains a fraction of that. We start from published research on each active, then hold the finished cream — the one that ships to you — to the same standard. No warming agents, no tingle, no fragrance standing in for results. If a formula doesn't perform on its own skin trial, it doesn't get a name.

Questions

The set
Morning and Night, together. The full routine in one order — nothing to match up or run out of separately.
One set includes both full-size formulas.