The Men's BODYFITZONE 260 Long Sleeve Half Zip top by icebreaker traps heat and releases excess moisture in a merino-based workout top for cold weather. The heavyweight merino wool blend is built with stretch. Zoned body mapping helps control temperatures. Merino mesh creates strategically-placed vents. Flatlock seams allow no chafing. Raglan sleeves and underarm gussets improve range of motion.