these dog goggles are made of ultrahard lenses, soft TPU frame and 2 adjustable elastic straps, lightweight and sturdy. Our doggy sunglasses accord with UV rate standard, lenses are UV-resistant and anti-glare. Translucent grey lens provide a not bad field of vision. Frame vents can disperse the inside fog, improve the safety of protecting dog's eyes. Wraparound glasses can stay in the dog's head pretty well without scraping dog's face and eyes. Prevent droplets, tiny stone into puppy eyes when dog stick the head out the window on car, SUV. Protect dogs eyes when they runing, skiing, traveling. They are great hepler for outdoor eye protection. Great for most small to medium breed dogs, Schnauzer, Corgi, Jack Russell Terrier, Beagle, Boston Terrier, Yorkshire eyes protection. Not recommended for tiny/mini dogs like mini chihuahua, mini doberman. Frame Bridge Perimeter: 8", Height: 2". Head Strap: 13.5"-18", Chin Strap: 6"-9". (No Tensile Measurement) Adjustc straps after putting on to avoid glasses slipping off and hurting dog eyes.