La Sportiva Olympus Mons S Boots - Men's Yellow/Black 45.5. Dual BOA closure system allows you to fine tune the fit. Double removable PE and EVA thermal booties together with the Vibram LITEBASE and MOREFLEX expanded EVA outsoles insulate and provide comfort and customization. Specifications for La Sportiva Olympus Mons S Boots - Men's: Manufacturer: La Sportiva Gender: Male Color: Yellow/Black Footwear Type: Boots Weight: 37 oz Insole Material: 3mm Honeycomb Tech insulating carbon Midsole Material: Polyurethane Features of La Sportiva Olympus Mons S Boots - Men's Maximum thermal insulation with space-age technology Vibram Litebase and Vibram MorFlex expanded EVA provide a lightweight abrasion resistant and thermally insulated outsole (non-tech binding compatible on S version) Corner Zip zipper allows full opening and direct access to the Dual BOA closure system Double removable thermal booties Dual BOA system differentiates the lacing between the upper and lower portions of the internal boot designed to be used with gloves Compatible with various non-automatic semi-automatic and automatic crampons. Crampon compatibility is NOT ensured and boot-crampon compatibility needs to be inspected Package Contents: La Sportiva Olympus Mons S Boots - Men's La Sportiva ZFMS089-Y00K00-45.5: Olympus Mons S Boots - Men's Yellow/Black 45.5