Icebreaker Merino Everyday Base Layer Long Sleeve Crew Neck Shirt, Zealand Merino Wool ALL-WEATHER COMFORT: This slim fitting jersey features highly breathable merino rib fabric to cool in hot weather & insulate in cold weather under a top or shell. Merino's natural odor resistance makes it great for workout or as a casual, everyday shirt. BASE LAYERS: Womens base layers from Icebreaker are breathable in warm weather & insulating in cold weather. From short sleeves & long sleeves to leggings, we use the finest merino wool for the most comfortable, lightweight, moisture-wicking material. TOP TO TOE LAYERING: Our clothes transcend single usage; we make multi-functional pieces that adapt to your life & style, on the mountain, in the city & at home. From wool socks, boxers & bikini briefs, to trench coats, windbreakers & fleece hoodies. SIMPLICITY & LONGEVITY: We want our clothing to be relevant for years. Through high quality performance, Icebreaker's merino wool base layers, first layers, mid layers, and outer layers will thrive in your wardrobe and your activities for many seasons. PREMIUM LAYERING: Try Icebreaker's merino wool under-base, base, mid, and top layers if you've used similar products from Woolrich, SmartWool, Marmot, Columbia, Carhartt, Hatley, The North Face, Helly Hansen, Levis, Ben Sherman, Browning, or Mack Weldon.