La Sportiva G-Summit Mountaineering Boots - Men's Black/Yellow 40.5. With its unique removable liner and thermal insole the G-Summit is a customizable product based on the requirements of the user and the terrain/conditions of intended use. Specifications for La Sportiva G-Summit Mountaineering Boots - Men's: Manufacturer: La Sportiva Gender: Male Age Group: Adults Men's Shoe Width: Wide Color: Black/Yellow Footwear Type: Boots Activity: Mountaineering Weight: 29.2 oz Footwear Closure: Laces Fabric/Material: TPU Footwear Upper Fabric/Material: TPU Mudguard Shield Insole Material: 5mm Thermal Insole Outsole Material: Vibram Ice-Tech Midsole Material: TPU Features of La Sportiva G-Summit Mountaineering Boots - Men's Inner shell made with the patented Core-Wrap technology maximizes warmth while remaining ultralight. The BOA Fit System makes it quick to adjust the lacing fastener - designed to be opened and closed while wearing gloves in cold conditions. Optional liner addition can turn the G-Summit into a double boot for increased warmth. Vibram Dura Step compound offers the best grip for mountaineering excelling in low temps and wet terrain. the Ice-Tech tread is divided into two sections enhancing performance during ascents and hiking. Resoleable to reduce environmental impacts Package Contents: La Sportiva G-Summit Mountaineering Boots - Men's La Sportiva 31M-999100-40.5: G-Summit Mountaineering Boots - Men's Black/Yellow 40.5