Patented material and design create the ultimate cross country boot; Mesh outer layer provides 360 degree protection; Lightweight rip stop surface that won't retain water; Breathable to aid in cooling of the legs; Non-slip lining prevents slipping and rubbing; Revolutionary strike guard made from high quality TPU; 10.75in boot height, 13.5in circumference (Medium); 11.25in boot height, 14in circumference (Large)