The folding bridge design and foam pad inside of goggle for a flexible comfortable wearing. 100% UV protection and protecting your dog's eyes from wind, water, hard light and fog. Both sides have a vent to keep the air flowing through the glasses to prevent water vapor from forming. These dog sunglasses have adjustable straps for head and chin. Glasses frame length:5.9", wide:1.8", head ribbon:8.8"-16", chin ribbon:6.4"-10.4".