Cairn Evo PRO Features Our patented G-hook-and-loop heel and front strap system create an extra secure foothold that won&';t gum up in mud or pull off in whitewater. The Evo PRO&';s minimalist footbed conforms to your feet for superior ground feel, flexibility, and packability. Patented Cairn Evo PRO Design. Upper: Premium polyester and nylon Webbing Outsole: Ultra Grippy VibramA(R) Megagrip Strap System: Bedrock&';s Patented Y-Strap 3 point adjustment system with Whitewater grade Heel-Hook strap Weight: 7.9 oz per size 9 sandal Stackheight: 14mm stack height, zero drop Underfoot: Flat + minimalist EVA foam footbed Manufactured: US Assembled of Foreign Parts