Moderate support to sprains, with self-adjusting straps to prevent lateral injuries. Moderate lateral movement, maximal dorsi/plantar flexion. Elastic nylon covers a rigid plastic. Semi-rigid, contoured fit with lace-up design for a supportive fit. Fits both feet. Size according to shoe size: US MEN XS: 6-7 SM: 7-9 MD: 9-11 LG: 11-13 XL: 13-15 US WOMEN XS: 7-8 SM: 8-10 MD: 10-12 LG: 12-14 XL: 14-16