Doggles ILS are the first and only protective eyewear designed just for dogs! 16 years of experience has made our Doggles ILS (Interchangeable Lens System) the very best in pet eyewear. For true eye protection or fashion your pet deserves the very best. Doggles offer 100% UV protection shatter-proof lenses and anti-fog treatment on the inside of the lenses. Lenses on the ILS style are interchangeable and replaceable. This style is suited to all dog head shapes and sizes. Whether your best friend accompanies you on a motorcycle ride hangs their head out of the truck or car loves to sunbathe or is sensitive to light Doggles will be sure to keep their precious eyes safe. You can rest assured and they ll love the extra attention! Specifications: Item Weight: 0.4 lbs Size Weight of Dog Head Strap Chin Strap Frame Size Breed Example XS 1 - 10 lbs 5 - 13 in 3 - 7 in 3.5in Teacup & Toy sizes Chihuahua Pomeranian Yorkie .5 - 5 kgs 13 - 33 cm 8 - 17 cm 8.9cm