These fit perfect with both enduro and downhill helmets - I've used Troy Lee Designs, D3's, D4's and Stage helmets with these goggles. Great build quality, very durable and the colorway really pops. I have used Airbrakes (MX version) for mountain biking for years with no complaints, but the MTB version works better at slower speeds (plus, we're not dodging roost from other riders!). They are so good that I purchased two goggles in the Minnaar colorway and an additional black/grey colorway. Highly recommend!!