1. →SOLD AS A PAIR: These carbon fiber insoles for men and women are sold as a PAIR, not a Single Piece. They are suitable for sports and sneakers shoes, not for high heels or dress shoes. 2. →EXACT MATCH: You can order directly according to your shoe size. They will fit perfectly. Please use this carbon fiber insert below your original removable shoe insole or under orthotics. 3. →PURPOSE OF GE: These Carbon Fiber Insoles for women and men are 1.3mm thick and it was designed to allow minimized bending (minimum flexibility) with optimized stability. The Rigid Shoe Inserts reduce the pressure between the metatarsal joints and toes and help reduce foot pain and foot recovery. You can use them for Hallux Rigidus, Hallux Limitus, Turf Toe, Foot Fractures, Morton's Toe treatments. 4. →MORE COMFORTABLE LIFESTYLE: These insoles can be used for foot problems as well as while doing various sports activities such as Trekking, Hiking, Basketball, Football, Running, or during daily Walking. This rigid insole prevents your feet from getting tired in your daily activities. They are suitable for both men and women.