The new ARWA is perfect for high alpine, winter ice climbing and Himalayan ascents. Your toes will be toasty warm and dry thanks to the form fitting, durable and waterproof 2.8mm Split leather backed by DryLine textile - a unique interwoven combination of Sympatex 337 Professional and a wicking microfiber. This durable and elastic Polyester - Polyether membrane uses the natural movement of the foot to "pump" moisture out air spaces while also wicking through the fibers themselves. The difference is dryness that you can feel! The ARWA conserves your warmth by utilizing a triple layer of Thinsulate insulation - same as employed in the technical CERRO TORRES, the G1 and G1 EXPEDITION BOOTS. Other niceties include lightweight carbonglass shaft with Neoprene cuff and Velcro closure - locks heat in and keeping debris out; 3 piece adjustable Velcro tongue and Heel Fit System - with pads to grab and hold your heels down. Structure is Boreals PBG-680 (very stiff) midsole mounted to FDS-3 triple density outer sole backed by 10mm EVA-Pro for shock absorption and insulation. This is the "tweener" boot - as warm or warmer than some "plastics" but light and with a good fit that only a leather boot can provide.
Sizing: Easy, subtract 1/2 size from your US size and you've got the UK size - ie If a US 10.5 fits well in a hiking boot, then order a UK 10 for a similar fit.