evo.com | Mons Royale Long Underwear Tops > Bring the warmth without the bulk. The Mons Royale Olympus Merino Base Layer Long Sleeve Top packs heavyweight merino warmth into a soft, breathable layer that keeps up on cold-weather missions. Wear it under a shell, over a tee, or whenever winter turns the thermostat way down. 250gsm 97% Merino Wool, 3% Elastane Flatlocked Seams to Prevent Friction Raglan Sleeves for Easy Movement Slim Fit Merino Mesh Underarm Panels | Women's Mons Royale Olympus Base Layer Long Sleeve Top 2027 - Small Purple in Black | Wool/Elastane