Our Hunting Collars are made with Biothane and Stainless Steel buckles, O-rings and D-Rings. The O-ring on our Hunting Collar serves as a flexible, central point for safety that can help a dog escape if it gets tangled. The ring allows the collar to pivot, enabling the dog to move and potentially wiggle free from a branch or wire, preventing entanglement. The D-ring is for for a leash, ID Tags, Traffic Handle & Grab Tabs. Escape: The O-ring allows the collar to move and flex, potentially allowing the dog to back out of it if they get tangled, preventing serious injury. Flexibility: It gives the collar more flexibility than a standard, rigid collar. Leash Attachment: The D-ring gives a fixed point for attaching a leash Accessory Attachment: The D-ring serves as a secure point to clip on other accessories, such as dog tags. Waterproof & Easy to Clean: Ideal for all weather conditions; rain, snow, mud, or sunshine. Simply wipe clean after adventures. SIZES: (Sizing Chart at Bottom) Collars are made in 1" materialMedium 15" - 20" Large 18" - 23"XLarge 21" - 26" HOW TO FIT:When fitting to your dog for collars you should be able to fit 2 fingers between your dog and the collar. If you require different sizes or anything customer please send us a messagePERSONALIZE YOUR COLLARS: Our personalized collars are made with a Heat Transfer Vinyl (HTV). HTV is durable & versatile, but dog collars experience high friction, moisture, and scratching. Proper care helps maintain the design’s longevity. NOTE: With proper care, your HTV design will stay vibrant and last longer, even with everyday adventures.Questions about how to get your collars customized pop over to our FAQ Section to find details!