is dedicated to researching pet supplies, these pet goggles are authorized by , which made of quality PE frame and UV clear lens with bright black coating, so it's the translucent lens with very good vision. These dog sunglasses only recommend for small breed dogs, cats. If would like to try other breed dogs, need to measure their head size and the range of the eye base on size descriptioccurately. Inner soft foam mat can make your pet more comfortable to put-on. Elastic strap of head and chin can be adjusted to fit anytime. It is not only windproof sand, waterproof, dustproof, UV protection during travel, riding, walking outside, but also wproof, windproof at winter wfield skiing. Length: 4. 72", height: 1. 4", Head elastic strap adjustable 13", Chin elastic strap adjustable 12". (No tensile measurement)