100% acrylic, stretchable rib-knit fabric Double layered with fleece lining,super warm and unbelievable smooth touch feelings Rib-knit construction for added stretch and comfortable fit,Best fit for 56-60 cm/22.0-23.6 inch Ear covers keeps your ears warm and covered in cold weather Great for outdoor activities such as running, cycling, skiing, snowboarding, hiking, hunting, and any more others