KastKing Jetly Sport Sunglasses,Polarized Lenses,UV Protection,Light and Safe They are light weight (only 25 grams/0.9 ounce), which adds to the comfort of your sunglasses and sports eyewear KastKing swatch sunglasses have 100% Polarized Revo LMS technology coated lenses The polycarbonate lenses in swatch feather Lite sunglasses are the same material used for protective visors in racecar driving crash helmet