Brubeck Merino Active Wool Men Sports Fitness Functional Underwear Shirt 56% polyamide, 41% merino, 2% elastane, 1% polypropylene MERINO WOOL: Made of the finest quality yarn with merino wool fibres. UNIVERSAL: Midweight wool underwear suitable for all seasons. Two layers and a seamless design result in exceptional optimization of thermoregulation, which prevents the body from cold or overheating. ANTIALLERGENIC: Thanks to their antiallergenic and antibacterial properties, ACTIVE WOOL products do not trigger allergies or irritation and they pre- vent unpleasant odours.