This dog collar, made of 100% polyester (what seat belts are made of), is light-weight yet extremely strong and is sure to get everyone's attention in the neighborhood that your dog is well taken care of! Every seam is sewn down for your pet's comfort. Other Features: quick-drying and resistant to mold and mildew permanently dyed so colors will never run constructed with ultra-strong Wienerlock buckle solid metal d-ring Fitting suggestion: take a measurement around the neck then add 2 inches (5.1 cm.). This will give you the correct collar size which you can then adjust as needed. Size - Small: 9-13 in. (22.9-33 cm.) in length : 5/8in. (1.59 cm.) wide Size - Medium: 12-17 in. (30.5-43.2 cm.) in length : 3/4 in. (1.9 cm.) wide Size - Large: 16-26 in. (41-66 cm.) in length : 1 in. (2.5 cm.) wide