This dog collar is perfect for Firefighter supporters and dog lovers. This Thin Red Line collar is great for walking and training pets. Woven from high-strength nylon material, the dog collar is durable and lightweight, which allows you and your pet more comfort and freedom. Let your best friend show their support for the men, women, and dogs that walk the thin Red line. Thin Blue Line TRL-AM-LAN. Size Large (Dog's Neck: 16.5"-24.5", Collar Width: 2.5 cm). Support Firefighters. High strength material. Durable Buckle and Metal Adapter.