Just a heads up to all those that have to wear glasses and have some difficulty whilst kiting. After losing a pair of prescription sunnies due to a fall, I purchased some Bolle Tracker Safety Prescription Goggles and had a sunglass filter lens put in in place of the safety lens. About $200 with claimable script. These work perfectly and are easily washed after a session. They also come with adjustable strap that attaches to the arms via a rubber tube each arm. I left a (prescription) pair at Brighton Vic late last year, never found, but anyway these are a must have for glasses wearers.