The natural warmth of wool is mixed with recycled polyester to improve wicking in this warm and comfortable base layer.It´s stretchy for a great fit, the sleeves are long enough to cover to the wrists, and you might even use it to lounge around the house.It´s that comfortable.Espeficitations:125 g/m2 48% merino / 47% recycled polyester / 5% elastane fabric gives the warmth of wool with the durability and wicking of polyester.Machine washable.High collar. Compare prices from: Castelli in Man's Sportswear