Adjustable elastic strap, max. chest strap length: 80cm (chest circumference: 160cm), max. shoulder strap length: 30cm; Practical and comfortable to use; Compatible with GoPro: Helmet Hero, Motorsports Hero Wide, Motorsports Hero, Surf Hero and Hero Wide cameras; Not suitable for Digital HERO 5 Wrist Camera; Great for outdoor sport activities, such as skiing, mountain bike cycling, rowboat, etc.