Unique Hydrosil formula for superior, natural looking tan. Flawless color. Coppertone Endless Summer Sunless Tanning Lotion looks different, because it is different. Here are three reasons why: Superior, natural looking color: Only Coppertone Endless Summer dual-chambered products contain Hydrosil, a unique color activator that delivers enhanced color quality. Fast color development. Coppertone Endless Summer products with Hydrosil are the first and only sunless tanners that produce visible color in just 30 minutes so you can quickly smooth out missed spots and streaking. Now contains ScentMatrix for a cleaner, fresher fragrance.