Extra warm: 1.5 times warmer than regular HEATTECH. Neckline designed to enhance cold protection. Now in plastic-free packaging. - Packed with comfort features: bio-warming, insulating, moisture-wicking, anti-microbial, moisture-retaining, and more. - Stretchy fabric with a soft texture and excellent shape retention. - Crew T-shit with neckline designed to enhance cold protection. - A casual collar perfect for everyday wear.