Flat Pedal Friendly Mud Protection: Key Features:Super tough  nylon faced neoprene upper with highly durable overlays,Novel  hardwearing rubber open sole for flat or clipless pedals,Aggressive rubber toe section tread for added grip,Rear Velcro® closure with fit adjustment,Wide fit  suitable for varied MTB flat pedal and clipless shoes,Reflective trim,Clean shoes clean lines  muddy trails,Tight fit = clean shoes,Due to the variety of shoe profiles check compatibility with your shoe,.Construction:Neoprene 65%,Rubber 20%,PU 15%,.Size Guide:S/M -   EU 37-39  UK 5-6,M/L -   EU 40-41  UK 7-8,L/XL -  EU 42-73  UK 8.5-9.5..