The Tifosi Marzen Full Frame Sunglasses features the exclusive Swivelink technology that adapts to any activity. Each set includes removable sport ( vented, adjustable, with hydrophilic rubber ) and lifestyle ( sleeker, thinner ) arms - just swivel, switch and repeat! There’s no need to switch between multiple pairs of eyewear anymore, Swivelink is the complete sport optics solution for the active lifestyle.  Tifosi Marzen Full Frame Sunglasses Features 2 pairs of Swivelink arms – Sport arms and Lifestyle arms adapt to any activity Hydrophilic rubber ear and nose pieces for a no-slip fit Adjustable ear pieces ( Sport arms ) Polycarbonate scratch resistant shatterproof optically decentered lenses for optimum clarity Vented lenses increase air circulation & reduce fogging Fits M-L face size 23 grams 100% protection from harmful UVA/UVB rays Lifetime Warranty against manufacturer defects* Zipped hardshell case and a microfibre cleaning pouch.