Feature - Color: Black. - Materials: Velvet, TPU and Glycerin. - Size XXL: 31.3 x 11 x 0.6cm. - Size XL: 29.5 x 10.3 x 0.6cm. - Size L2: 28.3 x 10 x 0.6cm. - Size L1: 27.3 x 10.3 x 0.6cm. - Size M2: 27.0 x 9.2 x 0.6cm. - Size M1: 25.5 x 9.2 x 0.6cm. - Size S: 24.3 x 8.8 x 0.6cm. - Size XS: 23.3 x 8.5 x 0.6cm. - The massaging insoles are for back pain treatment and they will help you reduce the effects of Fibromyalgia, Heel Spurs and Plantar Fasciitis. - They will depress and give arch support thus increase the blood circulation levels of your whole body. - Warm Tips: Dear buyer, due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand