Peepers have been ergonomically designed for exact fit, helping prevent harmful ultra-violet rays from reaching the eyes. The stream-lined fit contours to the exact shape of the eye, eliminating the dreaded "Raccooning Effect" caused by the functional design flaws of other leading brands. The slanted nose guard makes for NO TAN LINES. For added safety and a higher level of optical clarity, Peepers utilize only quality Kodak lenses which allow you to make adjustments in the bed without ever having to remove the goggles. Peepers come equipped with an adjustable string for a secure comfortable fit.