If you need a versatile shirt that can be worn as a base layer or as the outermost layer on sunny days in the mountains, the Icebreaker Women's Butter Rib Racerback Tank is for you! The top is made of 100% Merino wool, which makes it extremely comfortable to wear, even during high-intensity activities in warm weather. The Merino wool helps to regulate temperature, is moisture wicking, breathable and antimicrobial. Plus, the Racerback straps allow for great manoeuvrability whether you're climbing, hiking or running. So, no matter the sport, the Icebreaker Women's Butter Rib Racerback Tank will feel great on your skin!