Helly Hansen Warm Freeze 1/2 Zip - Men's: Our HH Warm Freeze half zip is a baselayer with an attitude. Back at the lodge, by the warmth of the fire, you can take off the outer layers to reveal the fashionable baselayer. Lifa® T3™ hollow fibre technology and Merino wool give it a luxurious feel next to your skin. The seams are placed out of the way of high friction areas and are stitched with flatlock stitching to minimise bulk. The half-zip lets you adjust the warmth and ventilation of the neck and upper chest area.