Whether we are out camping or just lounging around the house, the Helly Hansen LIFA Merino Wool Base layer Set is a must-have for the fall and winter months. Made with a Merino wool and polypropylene blend, the Helly Hansen LIFA Merino Wool Base layer Set is super warm and comfortable. An elastic waist makes for the perfect fit while the flatlock seams increase comfort and reduce irritation. Finally, an extended rear hem allows for more coverage over the rear.