Our therapeutic massaging insoles have a revolutionary design that allows your foot to float on of the liquid glycerin as you walk giving you a constant foot massage. Because liquid is self leveling, your entire body weight will be distributed evenly across the entire surface of your foot relieving pressure on your back and knees. 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 x 0.6cm. - Made of material for comfortable wearing. - Cleverly designed that will allow your foot to float on of the liquid Glycerin. Feel the instant pain relief and say goodbye to foot and knee pains once and for all. - The massaging insoles are for back pain treatment and they will help you reduce the effects of Fibromyalgia, Heel Spurs and Plantar Fasciitis. - Our liquid filled foot insoles have a thin and flexible design. You won't feel a thing while wearing them, just a feeling of elevation and relief. - They will depress and give arch support thus increase the blood circulation levels of your whole body.