QUMY dog sunglasses are made up of a soft TPE frame and two adjustable elastic straps. Lenses are ultraviolet rays resistant. Sunglass vents can send out vapor to your dogs. Wide glasses can stay in the dog's head pretty well, and provide a good view, the soft frame won't hurt the fur on the dog's face and eyes, and more comfortable for your dog to put-on. Never worry about dogs stick the head out the car window when you riding or driving outside because these goggles can prevent some little rock or something might hurt the dog's eyes. Not only protect dogs' eyes from wind and sun in summer but also snowproof, anti-dust when skiing, running in winter. Head Elastic Straps: 8.5" -15"; Chin Elastic Straps: 7"-12" (No Tensile Measurement); Framebridge Perimeter: 12". Perfect for longe snout dogs like German Shepherd, Gree, Husky, Alaskan Malamute, Doberman and so on. Supplied with a zipper hard case nicely for storage so these sunglasses won't get scratched up sitting around, the exquisite pack also a great gift for the holiday.