1. FAST Airsoft Helmet:This helmet provides comprehensive protection and features an upgraded irregular paste panel that allows you to attach more helmet accessories. It also has ventilation holes and a streamlined geometry design that improves air circulation, breathability, comfort, fit and water drainage. 2.The helmet can be adjusted to fit head circumference sizes from 52 to 64 cm (20.5 to 25 inches). 3.Excellent Eye Protection The tactical mesh mask is made of high quality ABS plastic and features a PC lens with an impact resistance of up to 800 fps. This not only protects your eyes from cold wind, but also prevents harmful UV rays from harm. 4.TWO PRACTICAL MODES Our helmet mask can be used in two modes for added versatility. In normal mode, the head is fixed with an adjustable elastic band. In helmet mode, the mask can be attached to the four attachment points of the helmet with elastic cords for a secure and comfortable fit.