Icebreaker Size Chart A versatile favorite for cold-weather comfort, the 250 Vertex Long Sleeve Half Zip Crystalline is made from incredibly soft, 100% merino wool for natural stretch and warmth. Worn as a midweight base layer or warm mid layer, it's equally high-performing on a trail run in mild weather, on a cold day's skiing or for relaxing in comfort apres-ski. The merino fiber is naturally breathable and odor-resistant to keep you in your comfort zone, wherever your adventures take you, and the half-zip design lets you easily adjust to changing temperatures. The droptail hem offers additional coverage, while offset, flatlock seams prevent chafing when you're wearing a pack. Features: - Zip neck collar for temperature regulation - Offset shoulder seams prevent pack rub - Forward side seams for comfort - Underarm gusset for comfort and mobility - Drop tail hem for added coverage - Center back length: 69cm/27 1/4" size M - Icebreaker tonal embroidered logo - Fit: Slim - Fabric Weight: 260 Midweight - Fabric: 100% Merino Wool