Well, these fit well without a helmet.
It feels much more comfortable when I use my helmet although without one, it may add a big more pressure to your face.
ONLY BAD THING, my mesh mask does not fit with it lol. No matter how I flex it, the nose area won't fit, but that is OK.
Mask Fit Issue

Easily fixed by adding some extra adhesive soft velcro stuff I had lying around :P
The Sansei mask will actually require more modding to fit flush with the goggles, maybe one day I will start cutting it to fit properly, but for now, the mesh fits almost perfect (pressure points on the cheeks does get slightly annoying.