With their purposeful lack of support and rigidity, the Vapor Glove 3's activate your feet and legs towards a natural stride. - 0 mm heel to toe drop - Insole thickness: 3 mm - Sole thickness: 1,5 mm - Sole lug thickness: 2 mm - Durable full grain leather upper - Integrated insole with Aegis treatment against odour problems - Vibram TC5+ outsole It's a good idea to start barefooting bit by bit - you want to create a steady upward slope in your strength and coordination, without having to spend days or weeks recovering from an overdone exercise.