The idea of using neoprene as a barrier against the cold has been around since 1950s in wetsuits but was only recently adopted for cycling. The theory was; if it can keep you warm in near zero water submersion it can keep your feet warm on the bike. The FS260-Pro Nemo Overshoe proves this theory correct helping keep your feet warm on even some of the coolest dampest days. Superstretch Insulation Superstretch neoprene is used to ensure a snug fit over your shoes & a stretchy abrasion resistant sole & hard wearing aramid stitching makes this an overshoe that you can be ridden time & time again. High stretch fabrics provide zipperless access Superstretch waterproof thermal neoprene upper MTB & road cleat compatible sole Stretch abrasion resistant sole/heel Hard wearing stitching using aramid thread Reflective Trim Construction Neoprene 90% Nylon 10%