[For AirTag Compatible]Features a built-in holder for AirTag, allowing secure attachment to the collar for convenient pet tracking (for AirTag not included). [Adjustable Sizing]Multiple size options ensure a comfortable and snug fit for medium to large dogs, with adjustable lengths to accommodate various breeds. [Secure Tracking]The collar's design firmly fixes for AirTag in place, preventing loss even during active movement, improving the chances of pet retrieval. [Durable Construction]Made with tactical nylon webbing, this collar is specially designed to withstand the active lifestyles of medium and large dogs. [Stylish Design]A fashionable choice for pet owners who want both functionality and style in their pet accessories. Specifications: Compatible Model: for Apple AirTag Material: PU protective cover + nylon webbing Collar Width: 3.8cm for all sizes Size M: 36-48cm adjustable, recommended for 28-45 lbs Size L: 42-54cm adjustable, recommended for 45-65 lbs Size XL: 50-60cm adjustable, recommended for 65-90 lbs