Our warm, high-performance LIFA® Merino midlayer combines light, wicking LIFA® fibers with a soft merino wool exterior. Shell: 65% Merino Wool, 35% Polypropylene The versatile LIFA® Merino Midweight delivers wicking and warmth in any type of cold-weather activity. Our unique LIFA® technical fabric transfers moisture away from your skin, keeping you dry and comfortable. The 100% merino wool enhances the LIFA® with its natural warmth and breathability.