"The surface layer is made using sweat absorbent breathable mesh. This increases the foot?s ability to breathe whilst also providing excellent comfort. It is also fitted with Shock Absorbent Silicone Gel cushioning that helps with energy rebound and aids performance. They are also designed to give a prescriptive style of strong foot support with a stability control device that helps centre the foot and provide comfort and flexibility. Breathable mesh fabric Stability control Shock absorbent silicone gel Impact zone pads Air chambers Sizes 36-37, 38-39, 40-41, 42-43 & 44-45"