Design: Fully waterproof Direct injected rubber shell with a stronger bonding for durability 5mm Neoprene insulation keeps the feet warm NiteRays reflective technology for added safety after dark Odor-eliminating, natural and non-toxic Cleansport NXT(TM) treatment Kamik LockFIT technology cradles and supports the ankle, locking it into place for the perfect fit In-Shoe Comfort: Removable CushyStep Everyday EVA foam footbed Sustainable BLOOM(TM) RISE EVA foam midsole adds comfort and support Durability & Traction: NEOBUG synthetic rubber outsole provides reliable traction Additional Details: Comfortable down to -25deg Vegan-friendly Height: 9.44 in Weight: 1.73 lbs per pair Circumference: 11.81 (size 12)