SmartWool Men's PhD HiFi Training Beanie - Past Season wool Three panel crown design for ultimate fit. HyFi terry back and jersey knit construction for stragegic warmth. Contoured drop-ear headband for comfort and warmth. Ponytail exit and space dye thread on Wine colorway. 45% nylon, 39% Merino Wool, 16% elastane. One size fits most. Washer and dryer friendly!