Stiff soles and immobile shoes can cause painful symptoms in your nervous system and do not support your natural anatomy during daily activities. The most natural way to walk is barefoot.The ultra-light and flexible 4mm thin sole allows a natural gait, promoting the natural alignment of your feet. This effectively prevents common discomforts in your knees, hips, back, ankles, and feet.Unisex Women's 11-11.5 Men's 9-9.5