Release your feet from the constriction of shoes and stimulate your feet muscles and joints Abrasion-resistant polyamide uppers hug your soles and deflect trail debris; durable hypalon strap Vibram TC-1performance rubber improves grip and shock absorption without hindering feel Anti-microbial microfiber insert reduces biotic growth and keeps your feet dry When you get these, go easy! You've been wearing shoes for a LONG time and your feet and calves aren't used to working this hard Stick with it,