Creation Core 3M Reflective Mesh Padded Dog Collar Adjustable Nylon Outdoor Adventure Pet Collar SOFT MESH - The wide soft mesh padding and ergonomic design make this nylon dog collar is comfortable and does not cause wear on dog's fur or skin. 3M REFLECTIVE MATERIAL - Nylon webbing with 3M reflective material ensure good visibility and safety at night on the road. 3M REFLECTIVE MATERIAL - Nylon webbing with 6M reflective material ensure good visibility and safety at night on the road. LEASH ATTACHMENT POINTS - The O-ring is made of druable Zinc-alloy. SIZE - Please measure your pet's neck with a tape, it would be better to set aside 0.7-1.1 inches(2-3cm) to be sure there is enough space for your pet breath freely. Size XXS: 11"-11.8"(28-30CM); Size XS: 11.8"-13.8"(30-35CM); Size S: 13.8"-15.7"(35-40CM); Size M: 15.7"-17.7"(40-45CM); Size L: 17.7"-19.7"(45.-50CM); Size XL: 19.7"-21.7"(50-55CM); Size XXL: 21.7"-23.6"(55-60CM); Size XXXL: 23.6"-25.6"(60-65CM).