Men's riding jacket, Allstate Leather AL2041, euro collar with zipout liner and side zippers with snaps for adjustment. This is a very stylish quality cowhide leather jacket that will keep the wind off and the protection you would expect from quality cowhide leather jacket. Naked leather is a term popular among companies selling jackets, trousers, chaps, gloves and other riding apparel for motorcycle riders. It is smooth on one side and rough and nappy on the other. Manufacturers variously describe naked leather as "natural" or untreated when in fact it has usually been immersed in aniline, a chemical that keeps the surface porous, allowing the leather to "breathe." This makes it more comfortable in both cold and hot weather. Purists insist that all of the natural grain in naked leather must be preserved. Aniline is a chemical that smells like rotten eggs and is used in numerous industrial applications from dyes to the manufacture of acetaminophen. Semi-aniline cowhide leather has been dyed and then coated with a thin finishing layer. It is soft and has an even color. Its surface is more protected against spills and stains than is the more vulnerable full-aniline leather.