Waterproof rubber, 4mm plush Neoprene lining, removable insoles, a large extension gusset make taking 'em on and off a snap, plus Percussion's exclusive non-slip sole with deep & wide treads/ridges for grip & soil dispersal. Anti-twist steel reinforcement & SPS® (Shock Prevent System) cushioning with a honeycomb heel insert plus ergonomic shape - complete!