Waterproof Fi Compatible Dog Collar & Two-Tone Multi-Way Leash Set | Built With BioThane®Evergreen Dog Co now offers Fi compatible set that comes with a Waterproof Fi Compatible Dog Collar & our Two Tone Multi Way Leash *Please note this set does not come with the Fi module, that can be purchased through at tryfi. com. Fi Compatible Collar: Our waterproof Fi Compatible dog 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