Fi Series 3/3+ Compatible Martingale Collar With Buckle
- Current Processing Time: 3-8 business days

Take your Fi 3/3+ Compatible martingale collar to the next level with an added buckle! Adding the buckle provides a quick and easy way to put on and take off the collar, eliminating the need to slip it over your dog's head. This is especially helpful for dogs with sensitive ears or those who are nervous about collars slipping over their heads.
Crafted to combine both style & durability, these collars are lightweight, comfortable, and perfect for dogs all ages & breeds, ensuring your dog stands out from the pack. They include authentic Fi end-links to attach to your Fi 3/3+ tracker & are made "over the band" style. This style gives your Fi device extra protection, & allows the collar to still be functional without the Fi tracker attached.
- Made from high-quality, durable, eco-friendly polyester webbing
- UV & water resistant
- Quick drying to resist mold & mildew
- Easy to clean to keep your collar looking its best
- Reinforced stitching with heavy-duty thread
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Available in a variety of our exclusive and unique designs to match your pup’s style
- Due to the length of the fi tracker & added buckle to the martingale the smaller size collars will only have a couple inches of adjustable range
Want to personalize your buckle? CLICK HERE (Just purchase our plastic buckle collar style and add the buckle engraving upgrade to your order- Only available for our 3/4" & 1" collar widths) **We can't engrave on COBRA® buckles
Fi tracker is sold separately. If you don’t already have your own, purchase your tracker HERE. Use our code: SEAFLOWER20 to save $20 off the activation fee from your Fi Series 3/3+ purchase.


Stainless Steel: Known for its strength, durability, & low maintenance attributes. Ideal choice for all those beach-loving pups and those who are rough on their gear.
Black Metal: A popular choice for upgrading the look of your collar. While it's a stylish option loved by many, please note that coated finishes can wear/chip over time.
To keep your collar looking its best, we recommend hand-washing it with mild soap and warm water when needed. For stubborn spots, use an old toothbrush brush or dish brush to gently scrub the area. Rinse thoroughly and allow to air dry and then it will be ready for your next adventure.
Safety & durability is our top priority at SeaFlower Co. We use high quality materials and durable, thoroughly tested hardware for all of our products. Our products are made with ruff play in mind, but no pet gear is indestructible. Please inspect your equipment regularly for any signs of wear and tear & replace when necessary. It is the buyer’s responsibility to determine what gear is appropriate for their dog’s size, strength, and activity level. SeaFlower Co is not liable for any injuries or damage that may occur as a result of use.
I ordered 2 Fi compatible collars for my dogs and they’re perfect! I messaged the owner for help on deciding on sizing and she was so kind and helpful. The collars are great quality and all the color options are so fun!
We originally found Seaflower when looking for a Fi-compatible martingale collar back in 2022. We had a great purchasing experience and it’s held up very well over the last 2.5 years! We’d do better to wash it more often, but that’s on us…and a husky that loves dirt isn’t doing us any favors there.
I had a foster dog needing one in summer 2024 and did a bit of research to see if there were new options on the market since our 1st purchase - then concluded that Seaflower collars were still the best option for our needs. April very kindly expedited my foster’s collar as her transport to a new home was coming up rapidly. Collar was beautiful as expected and fit perfectly. I had been having nightmares of this pup slipping her collar at a rest stop along the interstate - it was such a relief to get her set up with a top-quality Fi martingale collar!
My latest (and 3rd) purchase was for another foster and I didn’t even bother researching, just came straight to the Seaflower website to place an order. It arrived very quickly and was the same great quality I’ve come to expect. (Plus the pattern choices are awesome - Kona looks fab on so many dogs.)
Seaflower is a fantastic small business and I look forward to continuing to purchase from April!
The collars are well made, easy to adjust, but don't loosen on the dogs. Super happy with my purchase!
Fi Series 3 Compatible Martingale Collar With Buckle
I was worried about getting the wrong size for my lab-pit mix (large chest, short everything else LOL) but April was very responsive and helped me with my harness decision. Now my pup wears his collar and harness combo all the time comfortably!