UNIQUE MASK DUAL MODE WEARING DESIGN:1. Elastic headband wearing mode,2.The mask is connected to the tactical helmet through accessories,Form a unified whole,Full head protection for the weare.The wearing mode can be changed according to your own needs,It can also be used alone Helmet material:Made by high quality durable material, 9 pieces of self adjustable EVA padding inside, Mask Material: The main material is heavy duty reinforce nylon, Our lens is made of PC which has strong physical properties. It can not only prevent the cold wind on the eye irritation,but also prevent UV rays from burning on the eyes TACTICAL EQUIPMENT INSTALLATION PLATFORM:Side Rails / Goggle Strap Clips NVG Shroud, Bungee Retention for NVG; Hook and Loop Panels for mounting flashlight, survival lights, signal recognition lights, and headset holder, etc, hook and loop Panels around, Allow provide extra place to unique your helmet with patch attachment. Adjustable suspender straps and chin/neck pad for best fitting,Adjustable buckles on the strap allow adjusting the tightness with one hand;fits for head circumference about 56-60cm 22-24.4 inch belong to L/XL.more suitable for The head circumference less than 24.4 inch for adults.(Not suitable for children and adults with small head circumference) According to buyers' feedback, our tactical helmet is too big, Actually, this helmet is L/XL,Not suitable for children and adults with small head circumference,If you feel your helmet is too big, you can also fix it by adding a helmet pad .