Description of La Sportiva Glacier General mountaineering and heavy-duty backpacking boot that is built to handle rugged and technical terrain. Similar to the Makalu with a softer flex and lighter feel. Features: Plush Dri-Lex®, an anatomically sculpted EZ Flex tongue and a deep padded heel pocket cradle your foot in comfort for long hauls with heavy packs Vibram® Ice-New crampon compatible sole accepts newmatic (aka new-matic, semi-auto or Scottish toe) crampons from many manufacturers Tapered 8mm Mtnflex insole with a half steel shank for serious protection and support when carrying loads or kicking steps in snow UPPER: 2.8mm Idro-Perwanger Roughout Leather/Vibram® XSV Rand/Removable EZ Flex Tongue with Dri-Lex® lining CONSTRUCTION: Board Lasted LAST: Makalu LINING: Dri-Lex® SOLE: Vibram® Ice-New MIDSOLE: PU Aircushion INSOLE: 8mm Mtnflex with half steel shank WEIGHT: 3 lbs. 14 oz.