Crocs Men's / Women's Prepair Slide Sandals - relief for tired, achy legs and feet Leave it to Crocs to design an innovative shoe that significantly reduces muscular effort while walking or standing. In fact, rigorous studies by US Ergonomics and the Michigan State Biomechanics Lab show that this slide sandal reduces foot pressure by up to 50% and muscle activity by 24.6%. Thanks to proprietary Croslite, an amazingly lightweight, closed-cell resin material, the shoe molds to the shape of your foot and evenly distributes foot pressure. The Croslite Ag footbed resists odor, bacteria and fungus. This is quickly becoming the "feel good" recovery sandal of choice after athletic activity, an easy go-to favorite.