"OPPO Silicone Elastimax Insoles provide longitudinal and transverse arch support, and help to redistribute pressure caused by body weight. The insoles use two different silicon densities, and so provide superior cushioning and shock absorption on the ankle joints, knee and hip when walking or practising sports. Size N3 fits US Men's shoe size 8-9 and Women's size 9-1/2 - 10, UK size 7 - 8, and EURO size 41 - 42 "