Fi Series 3/3+ Compatible Martingale Collar Without Buckle
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Elevate your dog's style with our high-quality Fi Compatible Series 3/3+ martingales, featuring our exclusive designs printed right onto the webbing. 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. These martingale collars include authentic Fi end-links to attach to your Fi 3/3+ tracker.
Martingale collars are specifically designed to provide more control than a standard collar & (when fitted properly) will prevent your dog from escaping or backing out of their collar due to the cinching function. While martingale collars don't prevent pulling, they are an excellent training tool for teaching your dog good leash manners. They are highly recommended by trainers as the go-to collar choice.
- 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
- Adjustable Fit: By including your dog's measurements, we can create a comfortable, secure fit that's just right for them. This is especially helpful if they're between sizes or still growing, so we can make any necessary adjustments to our standard sizing.
- Available in a variety of our exclusive and unique designs to match your pup’s style
- These Fi 3/3+ compatible collars are made in either the "overlay" fi style or "in-line" fi style.
- The overlay fi style gives your Fi device extra protection, & allows the collar to still be functional without the Fi tracker attached.
- The in-line fi style is where the end links are attached inline with the collar band. 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. The Series 3+ will still work with the overlay design for GPS tracking and fitness.
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.
Want to add a matching leash? CLICK HERE
The collar size you choose will be the circumference that the collar can adjust when it relaxed around your dog's neck. When tension is applied to the martingale it will reduce the collar's size by a max of 4" (3" for smaller neck sizes). For example if you choose the 16-20" size and your pup wear's his/her collar at 18", when tension is applied to the martingale it can tighten down to approximately 14".
The best to way to measure for these style collars is with a soft measuring tape or string. Gently wrap the tape or string around the following 3 areas. The tape should be snug but not too tight. If your dog has very thick fur be sure to get the tape closer to the skin.
Measure the following 3 areas:
- the widest part of your pup's head (A)
- the neck just behind the ears (B)
- the neck where the collar naturally sits (C)

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 love this martingale! It's well constructed and striking! The ring you attach the leash to is a little too heavy. My pup seems to shy from it when I go to put it on. I don't think he likes how heavy it feels between the heavy-duty hardware and the weight of the Fi unit itself. I really hope he gets used to it.
I use a thick martingale when we go to obedience training and it wasn't working to ALSO be wearing his Fi collar. I bought this Fi compatible martingale so he would only need to wear one collar to training. When we get home, I switch back to the regular collar, so the Fi unit needs to be removed from his SeaFlower collar and put back on his Fi collar. It only takes a minute or two. I gets tons of complements on the pattern (blue smoke) too!
Before I was using 2 collars, one for the Fi and one as a martingale. I tried to find a 2 in 1 and finally found this! Absolutely love it!
We ordered the American 🇺🇸 flag print martingale collar. We couldn’t be happier. It’s so nice to be able to include our FI series 3 with our everyday collar. Plus it looks great. Thank you
I chose the periwinkle martingale collar that is compatible with the Fi tracker. I already had a martingale collar in this pattern nylon so I was thrilled to find SeaFlower carried it too. The collar is vibrant, well stitched with secure hardware. It shipped quickly and looks striking against my white husky’s fur. The blue really brings out his blue eyes. If I ever decide to change up his collar style or color, I’ll be coming here first! I also love the martingale collar as it’s always worked well for me on many dogs and our trainer recommends this style as well so I’m very thankful that SeaFlower makes this style collar specifically.