Tech 7 Boots - Blue/Red/Navy - US 13Upper is constructed from a light microfiber that provides flexibility and abrasion resistance, Thermoplastic Polyurethane (TPU) shin-plate construction and a reinforced hook-and-loop closure offers a comfortable, highly customized fit, TPU blade system provides flexibility while helping prevent frontal hyperextension, Wide entry aperture and a hook-and-loop upper closure Thermoplastic Rubber (TPR) flap allows for a broad range of calf fit adjustments for comfort and support, Single-piece TPU panel with honey