This helmet is made of high-quality material, it has a unique modular design. Each style has three colors of lenses for you to choose from. 
Features:
Made of high-quality material, wide use.
Can replace myopic lens, head lock buckle system.
Modular design, customers can DIY.
The main impact resistance of the helmet reaches 1000FPS.
Multifunction equipment transfer base, fully enclosed design.
High corrosion resistance and impact resistance.
Specifications:
Item type: Helmet
Helmet color: Black, tan, green, silver(optional)
Circumference: Approx. 0.54~0.64m
Pacakge weight: 1900g / 4.18pounds
Package size: 0.35 * 0.3 * 0.255m / 13.7 * 11.8 * 10inch 
Package list: 
1 * Helmet
4 * Pair of Replaceable lenses
2 * Forehead attachment
1 * Steel wire protective accessory