Fi Compatible 3/3+ BioThane® Classic Buckle Collar
- Current Processing Time: 3-8 business days

Take your dog on any adventure with confidence, thanks to BioThane®. 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.
- Constructed with authentic BioThane® in either 3/4", 1" or 1.5" widths
- 100% waterproof, anti-microbial, & durable- making them perfect for any adventure from sea to summit
- 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.
- Low maintenance & cleaning is a breeze- just wash with soap and water or hose it off, & its ready for the next adventure.
- Reinforced with heavy duty screws at all stress points to ensure for the strongest hold. We believe screws are the most durable as the threads are tightened & reinforced to ensure your gear will never come apart
- 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.
Click here to add a BioThane® Leash
Fi tracker is sold separately. If you don't have a Fi tracker, you can purchase one 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 hardware choice for those beach-loving pup’s 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, coated finishes can wear/chip overtime.
Solid brass: is just that - brass all the way through to its core. Here at SeaFlower Co, we only use solid brass hardware & not brass plated (which has a much shorter lifespan). Solid brass is known for its strength, durability, and resistance to rust and corrosion. While it may develop a patina as it ages, this is a natural process that can be easily reversed with a gentle cleaning solution like Brass-o or lemon juice. Please note that this patina/tarnish can temporarily discolor white/light colored fur, but can be easily washed out.
- BioThane® is a piece of cake to clean. Wash in soapy water or just spray off with the hose and, BOOM, it's as good as new. Towel dry or air dry, and it's ready for more fun & dirty adventures! To keep your BioThane gear performing at its best, we recommend rinsing your dog’s leash or collar with fresh water after any water-based or dirt-heavy activities. Take special care to rinse the hardware on your BioThane® gear. This will help to rinse off dirt, grime, and salt water all of which can, over time, wear down the hardware.
- To ensure the longevity of your BioThane® product, avoid exposure to certain chemicals such as, DEET, insect repellents, topical flea and tick products, as well as lotions and body oils. This can lead to brittleness and cracking over time.
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 have been looking for a better fi collar for over a year and I have finally found exactly what I wanted. Blaze orange, neoprene and it’s the perfect size! I am a dog trainer and I am recommending your site and your products to all of my contacts (fi and non-fi). Thank you and I will definitely be reordering from you for the rest of my life!!!!
After chatting online with April about the collars and my chief complaint about the Fi collar (it's noisy where the two halves connect) I ordered a pair for my two beasts. Very nice, well made collars and whist it's not completely eliminated the noise (because the collar to Fi transmitter does emit a bit when the dog shakes or scratches), it's reduced it by 95%. I am very happy with the pre-sales customer service, fast order fulfilment, shipping tracking, and overall results.
Great quality products that looks very well-made and the color options are also wonderful. Customer service was great and love supporting a small business.
The seller answered all of my questions and was quick to respond. The item is of great quality and looks wonderful on our pup! Well worth the price.
Well made and as described! Ordering process was easy and shipping was prompt.
- 5 stars: 149 (99%)
- 4 stars: 2 (1%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 star: 0 (0%)
I have been looking for a better fi collar for over a year and I have finally found exactly what I wanted. Blaze orange, neoprene and it’s the perfect size! I am a dog trainer and I am recommending your site and your products to all of my contacts (fi and non-fi). Thank you and I will definitely be reordering from you for the rest of my life!!!!
This is my third time ordering from SeaFlower. Their collars and leashes have been sturdy, high-quality and easy to clean - exactly what I needed with one (and now two) strong, high-energy GSPs. Several years have left very little visible impact on our first leash & collar set; the colors haven't faded, the metal grommets and clasps are still fully intact and functional. Also, the Fi connectors have not failed yet, despite my girls putting them through the wringer when they hunt in the woods. I hope they continue keeping up this quality!
Beautiful well made, the colors are as shown and vibrant the collar is easily cleaned, and I love the style
Second collar purchased from April. The first, over a year old, still looks new and it is worn by an active lab. April responds quickly to questions. Frankly, there is not a better-quality collar made, at least that I have found. I have a drawer full of other brands that were not well made. You will not be disappointed ordering from her.
Very satisfied with the collar. Looks good, well made with quality materials. Would recommend and buy again.
This is the second collar I have gotten from from this shop and I love it and would definitely buy again
I'm super happy with my biothane fi 3 collar. I've had a hard time finding fi 3 capable collars wider than 1 inch, and those are just too skinny and flimsy for my 90-pound all muscle pittie mix. I like the simple design and easiness of hooking up the fi piece. Hardware is great quality, and the biothane is bright and strong! I ordered 2 different collars in my 1st order, and I just placed an order for 3 more since I like to switch up the colors my boy wears. I would highly recommend this seller to anyone looking for a 1.5-inch fi capable collar.
This collar was exactly what I was looking for I like wider collars on my dog since he is a larger German shepherd. My questions I had where answered in a timely manner and the quality of the collar exceeded my expectations. I am definitely ordering another for my other dog and I would recommend this shop to anyone
I have bought two of those collars from this company! The reason I bought the second one was because my dog outgrew his puppy collar. I'm sure this one will last years. They are durable and easy to clean.
Very good quality, sturdy material and vibrant colors. I measured my dog wrong so I asked the owner to adjust my collar after receiving it and they did a great job! I got it back within a week and it fits perfectly, great customer service!
This collar is very well made and fits like a glove! It's very hard to see on husky fur but he loves his new collar! ❤️
I love this collar, the only downside is that the “rivets” are screwed together instead of traditional rivets. I have a long coated German Shepherd and his hair is always getting caught in it.
Such great quality and seller was very helpful. The collar I had before irritated my dogs neck but this one doesn't at all. Love it!
Purchased for my dog with skin issues--has been the only collar that was reliable, looked good, and didn't trap moisture into her neck. LOVE! Will purchase from again as is very high quality!
