The Helly Hansen Lifa Merino Womens Baselayer combines a 100% merino wool layer with their proven LIFA® Stay Warm Technology in a fitted 2-layer construction. LIFA® Merino MIDWEIGHT delivers all the breathable warmth of merino wool fibres, plus the unique moisture management properties of LIFA® fibres. This baselayer is very warm and perfect for any cold weather activity.