Waterproof membrane seals out water and lets moisture escape,Breathable mesh and TPU upper,100% recycled breathable mesh lining and 100% recycled mesh footbed cover,Super Rebound Compound midsole provides durable shock absorption to help reduce torque and allow for a smooth transition into the midfoot,Vibram TC5+ outsole provides exceptional traction for outdoor multi-sport activities, formulated exclusively for Merrell