bib pants from the mountain surf collection with recco reflector . the mountain surf bib pants have a relaxed fit and a high performance, fabric layout that uses two unique 100 % recycled materials. the seat and knees, where you get wet most often, are made from robust, waterproof 2l 20k fabric. the torso and thighs, where heat is generated during movement, are made from breathable 2l four-way stretch fabric. the pants are also lined with 100 % recycled polyester to keep you warm on cold days.