prost &reg; Elastic Mount Extendable Head Belt flexible Strap Band + Adapter for SONY Action Cam HDR-AS200V AS100V AS30V AS20V AZ1 FDR-X1000VR Material: PC + nylon Suitable head girth: 50cm; Can wear Gopro/SONY/Rollei/AEE, camera on head; Firm and anti-slip. Elastic strap, made of superior quality material, durable and usable Adjustable and compact design, meeting different requirements of the users. Light weight, portable, easy to take Great for photographing during riding and other sports through screw, and keeping your gopro camera safe on your head.