The Five Ten Moccasyam. Undoubtedly one of the most popular slippers ever made. For over 30 years, their iconic red uppers have been jamming cracks in Indian Creek, wrestling boulders in Joshua Tree, and hanging off the walls of El Cap. A quarter-half size too small for my feet. Used for about 4-5 climbs, not quite broken in yet so they are essentially fresh shoes! For reference, I wear 11.5-12 US in most street shoes.