DIMENSION MEASUREMENT: The head radian is 20cm long and the height is 5cm. The under radian is 5.5 cm. The head strap ranges from 16.5cm-27.5cm and the regulation range of the chin strap is between 13-24cm (Tension-free measurement). PROTECT YOUR DOG’S EYES: Not only does it provides a good view for your dog, but the soft framework doesn’t damage the fur of your dog’s face and eyes. It can prevent ultraviolet ray, wind, blizzard, snow, dirt and ashes. All in all, it can keep your dog from injury under the external environment. ADJUSTABLE STRAP: The dog goggles have a high level of elasticity with adjustable length. It is suitable for small dogs and medium dogs. The double strap - the head strap and chin strap enables your dog to wear it in a sturdy way. The goggles don’t fall off easily. LIGTHWEIGHT, SOFT & DURABLE: The pet sunglasses are formed by UV-resistant PC lens and silicone optical frames, which is proven to be supple and lightweight. It can be used for quite a long time. Your dog feels way comfortable without any burden when wearing our goggles. UNIQUE & SPECIAL APPEARANCE: This pair of dog goggles design is in perfect accordance with the dog’s face, so the slightly curved goggles cling to your dog’s face precisely. Meanwhile, there are vent holes around the dog glasses that look like comb teeth, these dense holes can quickly dissipate among the heat generated by the dog.