Longline at the centre back to prevent air from entering. Thumb loops to protect the top of your hand from the cold. Lightest weight of wool at the underarm (190 g/sqm). | Forclaz Women's Merino Wool Long-Sleeved Backpacking T-Shirt - Mt900 in Navy Blue, Size XL Zip Collar, Lovely Tops, Backpacking, New Product, Moisture Wicking, Merino Wool, Womens Shirts, Navy Blue, Size Medium