Our large dog sunglasses accord with UV rate standard, lenses are UV-resistant and anti-glare. Frame vents can disperse the inside fog, improve the safety of protecting dog's eyes. Wide goggles can stay in the dog's head pretty well without scraping dog's face and eyes. Prevent droplets, tiny stone into dog eyes when dog stick the head out the window on car, SUV. Protect dogs eyes when they runing, skiing, traveling. They are great equipment for outdoor eye protection Fit most medium to large dogs like German Shepherd, Pitbull, Lab, Gree, Husky, Doberman, Retriever, etc. Even Great Dane, Saint Bernard. Suitable for many dog breeds. Frame bridge Perimeter: 12", Head Elastic Straps: 16" -21", Chin Elastic Straps: 7"-12". (No Tensile Measurement) Adjustc straps after putting on to avoid glasses slipping off and hurting dog eyes.