A heavyweight merino base layer top designed to help regulate temperature during high-intensity activity, the 260 ZoneKnit™ Long Sleeve Crewe features 100% natural merino wool. Features ZoneKnit™ - Engineered body mapped technology to regulate your body temperature and let your skin breathe during high-intensity activity Thumb slits keep your sleeves in place and hands warm Raglan sleeve construction for mobility Gusseted underarms for mobility and comfort Flatlock seams to prevent friction Drop tail hem for added coverage