Perfect for minimalist wet wading, our comfortable and durable YulexA(R) Wading Socks with Gravel Guard are made with 85% natural rubber and 15% synthetic rubber by polymer content. The fold-down gravel guards attach to wading boot laces with hooks. Fair Trade Certified(TM) sewn. Product Features: Fold-down gravel guards attach to wading boot laces with hooks Dense footbed to help minimize compression Fair Trade Certified(TM) sewn, which means the people who made it earned a premium for their labor Product Specifications: Fit: Regular fit Sizes: XS, S, M, L, XL, XXL Material: Exterior: 3.5mm 85% YulexA(R) natural rubber/15% synthetic rubber by polymer content. Lining: (upper) 100% recycled polyester jersey; (footbed) 95% nylon/5% spandex. Natural rubber is from sources that are Forest Stewardship CouncilA(R) certified by the Rainforest Alliance. Fair Trade Certified(TM) sewn