Dog is my copilot.
Join Date: Oct 2005
Location: Calgary, Alberta
Posts: 802
Bikes: Lemond Maillot Jaune, Specialized Stumpjumper, Kona Jake the Snake, Single-Speed Rigid Rocky Mtn Equipe, Soon-to-be fixed Bianchi Brava
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UV rays will degrade the foam in a helmet reducing its effectiveness. Every 4-5 years has always been my rule of thumb, but I'm at 52 degreess north where the UV index rarely crests 8 its probably a shorter time period where you are.