Product Size: The longest part of the lens is about 17cm. The widest part is about 5cm. The strap width is about 2cm, and the chin strap is folded to the longest about 19cm and the shortest to about 9.5cm. The amount of fold-up of the back of the head strap is adjusted to the longest about 17 cm and the shortest to about 8.2 cm. Color: big red, blue, black material: plastic Package content: 1*pet glasses 1.Lightweight material: plastic frame and resin sunglasses with elastic band, light weight, convenient for your dogs. 2.Adjustable Strap: Easy to wear with adjustable elastic length, better fixed, with careful design of the jaw strap, not easy to fall off. 3.Deeper glasses: Deeper built-in lens cup with vents on the sides to create steam. 4.Eye protection: Protects your dog's eyes from UV radiation, wind, water and dust during outdoor activities. 5.Cool gift: A cool gift suitable for dogs with a head circumference of 32 cm to 50 cm.