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Base layer bottoms
These low-profile pants provide warmth and comfort, sitting under your outer pants. Synthetic or natural fabrics trap air between the fibres, and wick away moisture to keep you dry and warm. For a winter walk, you want to choose a pair that have a high weight/gm (200 or above) for warmth. Merino wool is a great insulating fabric, it wicks away sweat and keeps you warm. It is also odour-free, so you can wear the same pair for longer.