LIFA Merino 1/2 Zip Top Baselayer - Men's Medium - Extra Warmth for Cold Weather - Multisport 2 in 1 baselayer. Color - Black.

LIFA Stay Warm Technology is a unique fiber invented by Helly Hanson and used in our baselayers for more than 40 years.  No matter what activity you are doing, LIFA Baselayers are a perfect first layer to have next to your skin.  Simply put, LIFA pushes moisture away from your skin, so that you can stay warm and comfortable.