The Icebreaker 260 Tech men's half-zip baselayer long-sleeved shirt offer all the natural benefits of merino wool in a versatile, comfortable design. The merino wool jersey of that baselayer insulates during cold winter days on the trail or the ski slopes, and it resists odours and breathes efficiently on runs, hikes and summer trips into the mountains. This garment is part of a layering system that provides comfort and warmth for your outdoor activities. Easy to layer, this base layer enables you to regulate your body temperature by wicking moisture away. This onion layering system is made of three types of clothing. The first layer, worn next-to-skin will provide warmth and quickly move moisture away from your skin. Then, the second layer, is the insulation or fleece, that provides warmth while also dissipating heat during periods of high output. And finally, the third layer, the shell, which is the most weather-protective layer, worn on the outside of all other layers.