Simple, natural and high performance is often what you want in a base layer, and Icebreaker's Women's Merino Wool Oasis Crewe Bodyfit Active Base Layer is all of that. Merino wool is perfect for keeping New Zealand high mountain sheep comfortable and happy, insulating to warm them in the winter, and breathing and wicking to cool them in the summer. Merino wool works like this for you too. Icebreaker merino wool resists odor naturally so you can wear it for days or even weeks without washing it - and when you do get around to washing it, it's easy care: machine wash cool and line dry. This lightweight material has ultra-fine fibers so it feels soft and won't itch, plus it resists static electricity build up so it won't cling. It also offers sun protection (UPF 50+) when worn by itself as a light outer layer. Design details on the Icebreaker Oasis Crewe include raglan sleeves and forward side seams to prevent chafing, gussets for flexible mobility, and flat sewn seams for next to skin comfort.