Easy to use. Simple to clean. Made with a super strong flex-poly strap, the all-weather Collar is comfortable and functional. It's also dirt and odor-resistant. XS:Neck: 7-10.Strap width: 1/2S:Neck: 8-12Strap width: 3/4M: 12-15Neck: 3/4Strap width:L:Neck: 15-18Strap width: 1XL:Neck: 18-23Strap width: 1