Reflective: Reflective stitching make your pets more noticeable in dark, they are safer while jogging, running, or walking Comfortable and Durable: Dog collar is made of thick and breathable nylon, heavy duty construction ensures long-lasting use for active dogs Adjustable Wide Range of Sizes: XS: 5/8"W, Length 8"-12"; S: 3/4"W, Length 10"-15"; M: 1"W, Length 13"-22"; L: 1"W, Length 16"-26", Please measure the circumference of your dog's neck before purchasing Integrated Personalized Dog ID Tags: ilFindYou smart QR code dog tags personalized for pets contain modifiable pet online profile, emergency Info, multiple pet photos, when finders scan the QR code you will receive a real-time alert via email or phone call, It is not a GPS tracker Item: ilFindYou dog collar for large dogs; dog collars for medium dogs; reflective dog collar ilFindYou dog collar ultra-durable buckle is made of high-quality ABS material, the quick release buckle is not easily destroyed, it is soft and quiet, without any odor, installation is very simple, Pets will quickly adapt to it and like it because it is very comfortable to wear. ilFindYou dog collar is packaged in Exclusive and high-end packaging box, can be given as a present to pets on their birthdays or holidays. The QR code can easily record your pet's life photos, health status, identity information, and owner's contact information. When it goes missing, it can be easily discovered and retrieved.