Helly Hansen Men's Warm Freeze 1/2 Zip Base Layer Top HH Warm - A two-layer system that combines the insulation of Merino wool and the sweat-wicking qualities of Lifa fibres to create a baselayer that wicks sweat away from the body whilst keeping you insulated. Lifa Stay Dry Technology - Wicks away moisture to help keep you dry and comfortable. Merino Wool - Provides heat and insulation. Half-Zip - Allows for extra ventilation when needed, and aids in the easy on and off of the baselayer. Fabric Weight: 215 g / m2