Helly hansen warm half zip thermal top womens this helly hansen warm half zip thermal top offers professional level warmth and moisture management it is a double layer construction that combines lifa stay dry technology and 100 merino wool which makes it the perfect baselayer for all cold weather activities the top features long sleeves with a mock neck and has flat lock seams to limit the irritation it causes to your skin when worn womens baselayer top long sleeves mock neck