sboardcrazy, feel for you loosing prescription sunnies

When I purchased mine, the supplier sold me the safety strap that has the snake type ends, fitted over the arms. They wont come off.
He then recommended, when I use them, to twist the strap behind neck once, then drop the loop over my head, so the strap is around the front of neck. This way if they get forced off back side, they stay on, and same if forced over the front side. The loop stops them coming off.

Just remember when you go to take them off, the loop is at the front


Oh, and wear a helmet, saves sunnies, skin damage and head impacting hard bits.