Made of 100% stretchy and ultra-soft acrylic fabric, this ponytail beanie fits head circumference 57cm (22-3/8 inches, Size 7-1/8) comfortably. Designed with a reserved opening, it lets you easily pull out high ponytails or messy buns in cold weather. You can adjust the opening for high or low hairstyles to keep your entire head fully insulated without tangled hair. This practical time-saving hat is ideal for daily leisure, skiing, snowboarding, camping, hiking and all kinds of cold-weather outdoor pursuits.