1Made of high strength nylon plastic steel, making the helmet thick, and get lighter, firmer, safer and more reliable. 2The side of the helmet has a module guide rail system for ARC and for ACH, allowing for a wider extension of accessories. 3Imported super toughness material, toughness and hardness of the strengthening, ensure the lightweight human engineering principles, and make wearing more comfortable. 4Adjustable strap design for HEADLOC, easy to quickly adjust the length of the strap, making it more quick and convenient. 5The oval hole design on the roof of the helmet can well allow the head to breathe and dissipate heat. The extended accessories can also be fixed by wearing helmet straps and umbrella ropes. Item Type: OutdoorSportsHelmet Material: Nylon Plastic Steel Weight: Approx.833g / 29.4oz Applicable: M / L Head Circumference 60cm / 23.6in Or Less 1 x Helmet 1 x Manual 1 x Jig 1 x High Strength Nylon Dried Cuttlefish 1 x Suspension System 2 x Goggles Buckle