Signature Footshape allows feet to sit naturally within shoe Vibram Megagrip rubber offers superior grip on wet and dry surfaces Trailclaw canted lugs below metatarsals provide added traction underfoot Balanced Cushioning encourages better alignment and form GORE-TEX technology makes shoe waterproof, windproof, and breathable Innerflex grooves allow for flexibility and movement Upper:   GORE-TEX Midsole:   Compression Molded EVA Outsole:   Vibram Megagrip