Material: Premium TPU and stretch neoprene, soft and comfortable to wear. There is a composite luminous film composed of a light-absorbing layer and a light-emitting layer. It will fluoresce for 1 hour after 2 hours of intense light exposure. The nano-coloring process is safe and non-toxic. Dimensions: 16cm x 13cm. Weight : 120g. One size fits all with adjustable velcro that fits most teens and adults. Performance: Lightweight, Breathable, Cooling, Comfortable. 800 FPS Protection. Protect your lower face, teeth and nose from projectiles fired at 180 meters per second. Usage: Perfect for Airsoft or BB Gun competitions, Live CS, tactical games , Nerf battles, survival games, cosplay, outdoor parties, Halloween, costume balls, etc. Due to factors such as manual measurement and display differences , there may be slight differences between individual products and images, please excuse me.