Eco-friendly PVC plastic glasses frame, sturdy and durable. The lens with UV protection coating can protect your pet's eyes from the sun's rays at all times. Foam padding inside the sunglasses for comfort and skin-friendly . The spacious interior structure won't press against your dog's eyes. Fully enclosed goggles would prevent pets' eyes from being damaged by wind, dirt, sand or anything flying through the air. Adjustable flexible head and chin straps need to be adjusted and tightened for the dog glasses to fit snugly, otherwise, they easily move all over your dog's muzzle and hit their eyes because they are not snug. Adjustable size from head strap: 20 to 30 cm Adjustable size of the strap on the chin: 15-24cm. Suitable for small to medium sized dogs. Please measure your pet's size before purchasing. These goggles for small dogs are ideal for sticking the dog's head out the window during car driving, also for pet activities. outdoors such as parties, photo booths, travel, daily use and other outdoor activities. It is also a great gift idea for Halloween, Christmas, New Year.