Acrylic One size fits most; head measurement: 57 cm, 22-3/8", Size 7-1/8 Made with 100% acrylic; measurements: 9.75" x 4.0" Inner sherpa/fuzzy lined for extra warmth Stylish accessory to match with cardigans, scarves, leggings and more Adjust to wear for a ponytail style, low messy bun, or regular with an inner button closure C.C Cable Knit Fuzzy Lined Ear Warmer Ponytail Pony Headband - B1AE3E28Z