Evergreen Dog Co offers Fi compatible two-tone and single color waterproof dog collars ready for ANY and ALL adventures, with the bonus of being compatible with the world's smartest dog collar - Fi. *Please note this collar does not come with the Fi module, that can be purchased through at tryfi.com. Do you love hitting the trails with your dogs but find yourself always bummed out that your rope or nylon lead or collar is all wet, muddy, smelly or just overall gross after your adventures? Us too - which is why we set out to create waterproof dog gear that is easy to clean, light, and ready for any adventure! Our waterproof Fi compatible collars are made from genuine BioThane® for maximum durability and a look that is as close to traditional leather as you can get, all while being, odor-proof, stain-resistant, and toxic-free. Great for water, land and all adventures. Get the look and feel of leather with our unique waterproof dog collar, while not having to deal with the disadvantages! Fi Endlink Compatibility: The Fi Endlinks that we offer are compatible with the Fi Series 3 and the Fi Series 3+ modules. They are sourced directly from Fi. Why Choose a Fi Compatible Dog Collar? Compatible with Fi Series 3 and Fi Series 3+ modules Built from waterproof and stink-proof 1" BioThane® Easy to clean after muddy or wet adventures Available in single-color or two-tone designs Handmade to order in the United States Sizing: Since our gear is hand built, we'd be happy to built the collar to your dog's unique neck size if you share the size in inches in the comment box. We generally recommend that you choose a size that will fit your dog on one of the middle holes, this allows for adjustments on either side. In order to choose the best collar size for your dog, it is recommended to use a previous collar to measure from the clip to the end and use that as a baseline. If you are unsure about what collar size to choose, email us at [email protected] and we'd be happy to help! Hardware: You can chose between Gold (Brass) hardware, Silver Hardware or Matte Black. Please note that the Matte Black is more likely to chip and will wear faster but can easily be touched up with an acrylic pen or Sharpie. Our gold hardware is made of plated brass and the black hardware is powder coated. We use Trigger Swivel Snap hooks for extra durability. These hooks swivel all the way around and are brass plated or black powder coated. All of our screws are Chicago Screws and are top-rated for quality and durability.