Cold weather hikes and climbs in difficult terrain requires good leg wear protection and the Mission Pant would make a great choice. It combines Exolite soft shell hardwearing fabric with a Windstopper layer to keep legs from feeling the chill on exposed ridges, stopping the wind and drying out really quickly too. There are ventilation zips on the thigh to regulate your temperature when you are working hard and zipped hand pockets for essentials. For extra durability when wearing boots and crampons, there are reinforced kick strips and a adjustable hem with lace hooks so less chance of feeling a cold breeze creeping up your leg.
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