A sleek high performance base layer top, the Icebreaker women's merino wool long sleeve Vertex Zip Bodyfit active base layer offers natural cold weather base layer protection. Icebreaker Merino wool is perfect for keeping New Zealand high mountain sheep and humans worldwide comfortable and happy, insulating to warm them in the winter, and breathing and wicking to cool them in the summer. The lightweight material has ultra fine fibers so it feels soft and won't itch, and resists static electricity build up so it won't cling. Icebreaker merino wool resists odor naturally so you can wear it for days or even weeks without washing it - and when you do, its easy care: machine wash cool and line dry. The Icebreaker Vertex Zip has a drop tail hem that's easy to tuck into pants to seal up the potentially chilly gap there, and the graphic sleeve stripe inserts add an extra element of style. This warm base layer also offers sun protection when you wear it by itself on cool days.