The LIFA Crew is a performance base layer, delivering lightweight insulation and wicking for everyday use and high-performance activities. Not only is it warm, it also moves moisture away from your skin so you stay dry and comfortable. HH LIFA is constructed with 100% LIFA fibers that are quick-dry, breathable, and super lightweight. Continually perfected over the last 40 years, LIFA Stay Warm technology is the unique ingredient of all Helly Hansen base layers.