This is an indoor head protection hat with no brim. The brimless type makes it easy to use indoors. Product Number: KM-1000R; Standard: Size: M (21.7 - 22.4 inches (55 - 57 cm); Color: Black; Weight: Approx. 5.6 oz (160 g); Quantity: 1 piece; Material: Surface: 100 % cotton, Back: 100 % polyester; Accessories: Chin strap; Medical device classification: Not applicable Not included: No. Applicable [Approval/ Certification Notification] Not applicable [Medicine Sales Name] Not applicable [JMDN Code] Not applicable [Drug General Product Name] Not applicable [Hazardous Product Type] Not applicable [Hazardous Product Capacity] Not applicable [Hazardous Material Unit] Not applicable [JAN Code] 4562101524268