The Icebreaker Mens Oasis Long Sleeve Crewe thermal top has a new and improved cut and fit because we always have your comfort in mind! Some thoughtful design has been done with carefully-placed seams to avoid chafing, that also stays fresh while you're traveling and the underarms are gusseted for much better range of motion. This top is perfect, whether you're carving the slopes on your favourite local mountain or trekking across a high Sierra glacier. This long sleeve merino shirt is soft next to the skin, breathable, and warm. In regular fit, and 200 Midweight. Made from 100% Merino Wool, which is warm, highly breathable, and odour-resistant.