Premium Material: The lens is made of high quality polycarbonate, which can filter and reduce the intensity of UV, UV400, infrared and visible light. Protect your pet's eyes from snow, UV rays, wind, dust and fog. Adjustable strap: The strap is made of a high-elastic cotton elastic. The adjustable elastic cord fits different head shapes, so your pets can wear the sunglasses comfortably and firmly. Good protection for outdoor activities: the dog glasses are a good protection for your pet when you want to take with your pets outdoor like skiing, climbing, swimming etc. Sponge interior: the sponge is padded around the glasses, the high-density sponge is very breathable, and the heat helps relieve eye fatigue or pressure on the body and the dog is generally uncomfortable. Size reference: suitable for medium to large dogs like Golden Retriever, Molly, Goldie Shepherd, Huskies, etc. Not suitable for small dogs.