G3 Cutaway System
The Overdose Industries non-destructive G3 helmet cutaway is, to our knowledge, the best G3 helmet cutaway system on the market. Now in its second generation the release system actively clears the closure system from the helmet (removing both the chinstrap and the cinch-line that runs around the back of the head) completely opening up the helmet and allowing it to come off your head with the least amount of resistance possible. Ground tests have show the helmet to come off with as little as 2kg of weight attached to a GoPro mount. A side benefit from the cutaway is a stiffened chin section making the G3 a more stable platform for cameras.
Flying in the tunnel? Just tuck the handle up inside the liner and you're good to go (though always check with your tunnel instructor).