in warm weather thermal synthetic base layers shirts for reliable warmth and wicking in cool conditions and ultra-warm Merino Wool Base Layer Tops for natural insulation and odour resistance in cold environments. Good quality base layers shirts have seamless construction for reduced chafing and next-to-skin comfort. Hiking base layer tops work best when worn with breathable mid layer(s) and a Waterproof Outer Shell Jacket to create an effective layering system.
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