The famous "urea moisturizer" created by f.c. himself! This product underwent several dozen formulations before its current iteration. Its star ingredient is urea, a molecule found in the skin's natural moisturizing factor (NMF) that plays an integral role in improving skin barrier function. Urea is a multi-functional ingredient with the ability to hydrate and mildly exfoliate. It's so effective as a hydrator, in fact, that it outperforms vaseline in some studies. (1)