The Icebreaker W ZoneKnit 200 LS Crewe is a mid-weight merino wool base layer designed to regulate body temperature during high-intensity workouts. It is a great choice for high-paced training and adventures in cold weather. The ZoneKnit is made from 100% merino wool, providing natural ventilation and odor resistance. It also features strategically placed merino mesh panels for active temperature regulation. The raglan sleeves and gusseted underarms provide increased mobility, and the flatlock seams prevent chafing. Icebreaker is inspired by nature and utilizes the performance properties of natural fibers to offer an alternative to clothing made with petrochemically derived synthetic materials. Merino wool is an annually renewable fiber that is naturally odor-resistant, keeps you cool when it's hot and warm when it's cold, and also allows your skin to breathe for long-lasting comfort.