This is an indoor head protection hat with no brim. This is a non-brim type, so it does not feel uncomfortable. Product Number: KM-1000R; Standard: Size L: 22.8 - 23.6 inches (58 - 60 cm); Color: Gray; 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 Number] Not applicable [Pharmaceutical Sales Name] Not applicable [JMDN Code] Not applicable [Dangerous Product Name] Not applicable [Hazardous Product Capacity] Not applicable [Hazardous Material Unit] Not applicable [JAN Code] 4562101524299