- Size: 39 • Extremely lightweight design that enhances the feel between the foot and the ground. • Allows the foot to move more freely providing optimal comfort. • Hands-free: easy to put on and take off in a second. • Wide space for the toes, allowing movement and comfort. • Zero heel sole that helps maintain correct body alignment. • Thin sole that stimulates the nerve endings of the foot. • Flexible upper and sole that ensure better muscle function. • Lightweight design that prevents foot fatigue. • Removable insole with excellent breathability and absorption.