Optimal Panel Construction Design 3mm multi-stretchable Neoprene with water resistant PU coating for cold & wet conditions Bamboo Charcoal Fleece inner with strong insulating & antibacterial properties Multi-functional sole with hook & loop strap suitable for Race & MTB shoes Reflective elements for low-light visibility Sealed seam Kevlar reinforcement on the nose & YKK zipper 72% Styrene Butadiene Rubber 18% Polyester 10% Polyurethane