Out: Oiled nubuck leather, one of the few markets Sun double density ATV / Quad-slip and oil resistant. Rocker and heel protection. Velcro closure with adjustable buckle plastic replaceable and adjustable. Inside: Enter Drytex Form, waterproof and breathable. Protection molded TPU shin and ankle Fabric Polymer memory foam extra-soft. Special rigid nylon sole. Antibacterial inner shoe with replaceable APS system (air pump).