?[MATERIAL] Top layer??80% Nylon 20% Spandex; Cushion: Sponge Machine Wash/ Pack of 2 Pairs ?[RELIEVE PAIN] 3D Sponge Cushion perfect fit the foot arch, match with your feet arch, and gently relieve pain from flat feet; Massaging Cushion is comfort and support, relieves discomfort. ?[3D SUPPORT] Seamless splicing technology to the perfect combination of breathable nylon layer with 3D sponge pad; Low-cut, Shoe Shape Unique Design. ?[ANTI SLIP & LOW CUT] Silicone pad prevents it from falling off the foot; Low cut Shoe Shape Unique Design keep invisible. ?[NO SHOW] JARSEEN no show liners stop pretty close to the toe line, just covering the end of your toes. Anti odor invisible silicon patch for heel grip none slip hidden sock and insole; Perfect for ballet shoes, pumps, high-heel shoe, sneakers, flat shoe, boat shoes, loafers, ect.