SIDI X Power EnduroSPECS Lugged TA sole plenty of grip for walking Mechanically hinged ankle with mechanical stop limit for hyperextension Technomicro base material in all areas Adjustable calf plate expands to fit knee braces and large calves Inner heat shield made of high grip material Toe area covered in protective plastic An all new rigid, shock resistant, anatomically shaped heel holds the riders foot firm and thus resists twisting while offering added protection