evo.com | Outdoor Research Long Underwear Tops > The Outdoor Research Alpine Onset Merino 150 Crew Top is a next-to-skin layer built around a non-mulesed merino wool blend that stays odor-free through a multi-day hut trip. Flat-seam construction and raglan sleeves keep things chafe-free under a shell, and UPF 30 means you can shed layers at the summit without losing sun protection. Raglan Sleeves Flat-Seam Construction 53% Merino Wool Non-Mulesed Weight 5.47 oz/ 155 g Center Back Length 67.3 cm / 26.5 in | Women's Outdoor Research Alpine Onset 150 Crew Top 2027 - Medium Gray | Wool