A high performance cold weather base layer shirt, the men's merino wool long sleeve Icebreaker Apex Crewe Bodyfit active base layer is simple and natural. Icebreaker Merino wool is a great material for New Zealand high mountain sheep and worldwide active humans alike. It keeps you comfortable and happy in a broad range of conditions, insulating against cold, and breathing and wicking for a cool, dry feel in the heat. The lightweight material has ultra fine fibers so it feels soft and won't itch, and it resists static electricity build up so it won't cling. Icebreaker merino wool also resists odor naturally so you can wear it for days or even weeks without washing it û and when you do finally get to the laundry, its easy care: machine wash cool and line dry. The men's Icebreaker Apex Crewe graphic sleeve stripe inserts add an extra element of style to the warm base layer, and the Apex Crewe offers sun protection (UPF rating 50+) for days when worn by itself.