The NELION is comfortable on both trail and technical terrain - perfect for summer alpine treks and climbs in the Cascades, Sierras or Rockies. Boreal's use of premium waterproof 2.6 mm split leather and tall rubber rands assures good abrasion resistance for cross country routes, negotiating boulder fields and kicking steps in crusty snow. New this year is Boreal's Bi-Flex system for ease of ankle articulation and comfort. Use of the exclusive Dri-Line System - comprised of a wicking liner and water-proof textile layer - excels at vapor transmission to keep your feet dry and comfortable. Underfoot a 10 mm PU and EVA midsole absorbs shock while the Vibram Mulaz out sole provides traction on the trail and friction on rock - wet or dry. Compatible with all strap on and semi-automatic crampons. Use for summer glacier routes, alpine climbs and winter snowshoeing. Sold in UK sizes - example, if you wear a US 10.5 (UK9.5) hiking boot order a UK10 (US 11) for an equal fit. Guaranteed fit (see below). Shipped anywhere on the planet.