Lego minifig compatible Custom SI-Dan Toys HGU-56 Helmet with MFS-2 Faceguard and TA02 goggles, fits on a minifigures head and can be used with the SI-Dan toys Gas masks (if you don't use the helmets face guard). It also has a rail to clip ANVIS-S2, ANVIS 9, SD21, SD23 and PVS14 Night Vision Goggles and X500 Goggles - Not included. Comes in 3 parts, the HGU56 helmet, MFS2 Face Guard and TA02 clear goggles.