If you got FAST-style helmet, this is a necesary accesory for you. It combines the lower guard that protects your face and the eye protection in the same convient packet.
This mask works alone as it's own unit providing a low profile and easy to aim mask. The goggle-part is well vented and hence the air does not get stuck between the goggles and users face which prevents the fogging.
But where this mask really shines is that if you have a FAST style helmet, you can mount this directly to your helmet. This will turn your mask and helmet into one big entity which will provide full face protection with stylish and futuristic look.
The package contains necesary adapters for mounting the helmet to your helmet or just use it as a standalone mask.