La Sportiva Karakorum Mountaineering Shoes - Men's Green 38.5 Medium. Specifications for La Sportiva Karakorum Mountaineering Shoes - Men's: Manufacturer: La Sportiva Gender: Male Age Group: Adults Men's Shoe Width: Medium Color: Green Footwear Type: Boots Activity: Backpacking Weight: 3.5 lb Footwear Upper Fabric/Material: 2.8mm Idro-Perwanger Roughout Leather / Vibram rubber rand / Cordura cuff Insole Material: 8mm high density Nylon with anti-torsion plate Water Resistance Level: None Lining Material: Dry-Best Outsole Material: Vibram Couloir Midsole Material: SBR Aircushion Lining: Dry-Best Footwear Last: Makalu Available Sizes: Mens US 6 - 14 Features of La Sportiva Karakorum Mountaineering Shoes - Men's This boot begs for abuse again and again. We used a new tapered 8mm high density Nylon that provides a smooth flex and protection throughout the boot which allows for new-matic crampon compatibility and long lasting consistent flex. Ideal terrain: General mountaineering and heavy backpacking The 2.8mm Idro-Perwanger leather upper is ideal for water repellency breathability and durability An SBR Aircushion sole provides cushion and helps insulate from cold or hot climates Aggressive Vibram sole (semi-automatic crampon attachment) Multi-directional 3D Flex hinge promotes easy flex and a faster break-in period Package Contents: La Sportiva Karakorum Mountaineering Shoes - Men's La Sportiva 856-GREEN-42: Karakorum Mountaineering Shoes - Men's Green 42 Medium La Sportiva 856-GREEN-42.5: Karakorum Mountaineering Shoes - Men's Green 42.5 Medium La Sportiva 856-GREEN-43: Karakorum Mountaineering Shoes - Men's Green 43 Medium La Sportiva 856-GREEN-43.5: Karakorum Mountaineering Shoes - Men's Green 43.5 Medium La Sportiva 856-GREEN-38.5: Karakorum Mountaineering Shoes - Men's Green 38.5 Medium