4 way stretch, breathable Nylon and Lycra Spandex powernet upper - Suede sole Patented ExoArmor duet sole patches move independently - Fore foot pads are securely sewn with stitching both on the edge and interior - 5/8" one-sided plush elastic with Capezio logo holds footUndeez in place - Size Chart: Petite (UK 2-3 / EU 34-36) Small (UK 4-5 / EU 37-38) Medium (UK 6-7 / EU 39-40.5) Large (UK 8-9 / EU 42-43) X-Large (UK 10-11 / EU 44-45) Half sizes or extreme feet go up to next size.