SIZING - XSmall: Youth 1-4, Small: Youth 4.5-7 Women 5.5-8.5, Medium: Women 8.5+ Men 7-10.5, Large: Men 10.5-14, XLarge: Men 14-16 * This pocket size traction system is ideal for everything from winter hiking and trail running to ice fishing or even snow shoveling * 3/8 " spikes are consructed of hardened stainless steel for maximum durability * Tough elastomer shoe harness secures easily without straps and provides a snug and secure fit