Sunlight Protection: The lenses of these dog sunglasses have passed the UV-400 test, blocking more than 99% of UV rays. If your dog has eye disease, or enjoys outdoor sports, these dog goggles are a must-have Ultra hard material for safety: This dog hat helmet made of lightweight but sturdy ABS material and soft sponge, all give your dogs head the best protection when dog hit or bitten by other animals. Goggles height 1.3", Goggles length 4.5". Adjustable elastic head strap 13"-17", adjustable elastic chin strap:7"-10".Helmet Size: Suitable for dogs with a head circumference of about 14 inches. Range of strap: 16.5-18.5. Suitable for: small dog and large cats, such as Yorkshire, Bichon Frise, Dachshund, Shih Tzu, Schnauzer, Teddy, Chihuahua etc. Not for very mini tiny dogs, please check the size carefully before purchasing. Tips for use: Dog may hate these goggles the first few times use, you can let them the bonus of wearing these goggles, such as an outdoor riding or driving, when your dog realizes that the glasses are protecting him, he will loves these goggles soon.