HH Warm is a 2-layer construction combining Lifa Stay Dry technology and 100% pure merino wool, making it the ideal baselayer for all activities in cold weather. Staying dry is important to stay warm and comfortable. In addition, this baselayer is constructed with the unique Lifa Flow technology. Lifa Flow delivers super quick drying next to skin. It moves moisture away from your skin faster than other baselayer technologies on the market.