I wear a steen hansen (made in canada) helemet. I grabbed a set of pro-grip goggles. They don't fit very well. From the chin bar to the brow line of the helmet isn't very tall on the helmet. I removed the dirt deflector from the chin bar to add a bit more space but still the goggles don't fit very well. I have a big head and don't find that the goggles have a wide enough frame. I sure like the lense though. It's not a fully transitional lens but it changes from crystal clear to a tinted grey in the shadows while its still bright or tints blue when you're in the sun. Also the lens have a tear off posts. I haven't found a replacement tear offs but they sure were good while I had them.