Made of 100% Cotton Solid Color Unlined Riding Cap by CTM Unlined biker head wrap One size fits most up to 23" Machine washable Wear this riding cap under helmet during motorcycle rides or as a hat alternative. Riders of all ages can wear this versatile skull cap. The unlined do-rag creates a stylish look with or without a helmet with this functional head wrap. One size fits most up to 23 inches.