This a one-size fits most (S,M,L) but objects may appear larger in photo. This is a small mannequin head with a 21” crown measurement. Satin Surgical scrub bouffant that converts to a ponytail scrub bouffant, by wrapping the ribbon around your hair and tying it. This hat was designed for the operating room but can also be worn at night as a sleep bonnet. Single layer of Satin or 100% Polyester fabric, textured on the outside, smooth on the inside, with 100% Satin Ribbons. Satin Care Instructions: This fabric can be both machine washed and dried. However, we recommend washing with cold water on a delicate setting, tumble dry low, to ensure that the fabric retains as best quality as possible. For best results, we highly recommend hand washing and air drying this fabric.