Mark Paigen, President and Founder of Chaco, spent time as a river guide in soggy sneakers, so he used his background in custom shoemaking to create - you guessed it - the favorite footwear of river guides * Chacos are known for their contoured foot bed with exceptional arch support and a molded heel cradle that helps hold your foot in place * Straps pull through the bed for complete adjustability * Unaweep soles are sturdy Vibram with lug patterns and spacing that self-clean * ZX models have a double strap configuration for extra comfort and the ZX/2 has an extra toe loop for stability