The Icebreaker BodyFit 260 1/2-Zip Tech Top is a merino wool top that keeps your core temperature regulated: the wool's air pockets trap your body's heat in while the fibers absorb and release your sweat so you stay comfortable when moving fast on snow or icy ground. The zip collar allows greater control over your level of warmth or ventilation. The soft fibers sit snugly against your skin while forward side seams eliminate chafing while you move, and the regular fit allows for a little more wiggle room. Offset shoulder seams accommodate backpack straps and thumb loops keep sleeves in place. A drop-tail hem provides extra rear coverage. With this level of snug comfort and protection, you'll be able to focus on the line- or trail-at hand.