The Sensor MERINO EXTREME winter beanie offers reliable protection against cold and wind. Its heavy-weight ribbed knit is made of 100% merino wool. Merino wool is a 100% natural fibre known for amazing insulating and antibacterial properties. The excellent sweat wicking properties provide maximum comfort during your activities. Even if the fibre is still damp, it stays dry to the touch, is not cooling and maintains thermo-regulating properties.