Helly Hansen HH Warm Freeze Women's Half-Zip Running 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.