Cradles your feet with targeted cushioning that improves your athletic performance and prolongs the life of your shoes. Lightweight "PolySorb" polyurethane foam heel cupping and contoured arch support. Features a "SpenCore" material heel-strike pad and forefoot cushion. Ideal for walking, running, training and sports. These insoles work best for those with a medium to high arch. A low friction top cloth helps prevent blisters. "Silpure" antimicrobial material reduces odors. For half sizes, order the next size down. Includes 1 pair of insoles. Sizing: Size 1 (US Women's 5-6). Size 2 (US Women's 7-8, US Men's 6-7). Size 3 (US Women's 9-10, US Men's 8-9). Size 4 (US Women's 11-12, US Men's 10-11). Size 5 (US Men's 12-13). Size 6 (US Men's 14-15).