Fi Compatible 3/3+ 1" Width BioThane® Martingale Collar Collar Size:16-18" This is the style that

This is the style that comes with your standard fi collar and is the recommended fi style for the new series 3+ to ensure you get the most optimal accuracy with its additional behavior monitoring features

These martingale collars include authentic Fi end-links to attach to your Fi 3/3+ tracker

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Fi Compatible 3/3+ 1" Width BioThane® Martingale Collar Collar Size:16-18" This is the style thatTake your dog on any adventure with confidence, thanks to BioThane the 100% waterproof, dirt proof, and adventure proof material. Whether your dog loves to swim, hike, surf, or play in the mud, our BioThane gear is designed to keep up with your dog's active lifestyle. With a range of colors to choose from, you can find the perfect collar to match your dog's personality. Martingale collars are specifically designed to provide more control than a