The Macpac Womens 280 Merino Crew Long Sleeve Tee is a versatile top that can be used as a mid layer to add warmth when you hit the trail or as everyday casual wear during the cold winter months. Merino wool provides natural temperature regulation and odour resistance while polyester bolsters the overall fabric strength, and a touch of elastane adds stretch for free movement and comfort. Grown on the backs of merino sheep, merino wool is a naturally renewable and biodegradable fibre - good for you and the environment!