OOfoam is a special material used for OOFOS products, unlike typical EVA midsole which is intended to produce forward power, it can reduce impact by 37% and reduce impact on the soles of your feet. Therefore, it can reduce the burden on your knees, hips, and back, and the ergonomically designed footbed gently hugs your feet and provides excellent arch support. Unlike cheap EVA flip flops on the market, OOFOS is a patented high density footbed with non-toxic materials and paints, so you can experience the most comfortable wearing experience.