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For navigation, you can also browse the \u003ca href=\"\/collections\/mens-running-base-layers-and-running-underwear\"\u003emen's collection\u003c\/a\u003e or see all \u003ca href=\"\/collections\/womens-running-base-layers-and-running-underwear\"\u003ewomen's styles\u003c\/a\u003e. The goal is simple: choose the lightest effective layer for the session, then add coverage only when weather, pace, or exposure demands it.\u003c\/p\u003e","products":[{"product_id":"merino-165-base-layer-long-sleeve-black-901-sm20008","title":"Merino 165 Base Layer Long Sleeve","description":"The Merino 165 Base Layer Long Sleeve is made from nature’s most advanced performance fabric – 100% superfine merino wool. Naturally technical, it regulates body temperature, wicks moisture, and provides lightweight insulation to keep you warm without overheating. 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