The weather changes swiftly; Smith thinks your goggles should, too. Two quick-release tabs at the top of the frame let you switch, even with gloves on, between low- and bright-light lenses faster than you can say “inversion layer.” The I/O fits nicely on most helmets and its strap’s silicone backing keeps the goggles from slipping. Both lenses are included. [$165; smithoptics.com]