Helly Hansen Dynamic Long Sleeve Crew Baselayer Top - Women's: The Helly Hansen Dynamic Long Sleeve Crew Baselayer Top is an under layer you can trust whatever the temperature. This womens under layer is made by the best materials, developed for professionals and arctic adventurers. Made with the Helly Hansen Lifa® StayDryTM concept. Helly Hansen Innovative Lifa® technology transports humidity to the outside better than any other fabric. Whatever the temperature, you will feel the comfort of dry skin.