Doot’s products are handmade in the USA using high quality materials. Each collar is made with durability in mind and we offer several heavy duty upgrade options. We are passionate about pets and proudly give back to help homeless pets in our community. MD- 12-17.5" LG- 13.5-21" XL- 17.5-28" - 1” heavy nylon 4,200 lb strength or super heavy nylon 6,100 lb strength. - YKK side release plastic buckle or upgrade to metal - Metal slide for size adjustment (Heavy duty plastic for super heavy) - Metal keeper to help prevent size slippage - Welded triangle ring for hooking leash and tags is stronger and more reliable than standard D ring - Triple stitched box stitch, heat cut webbing and treated ribbons for product performance and durability. Products are tagged with a simple hang tag. Summer, Fall, Winter, Spring, Handmade, Gifts, Dog Mom, Dog Dad, Unique,