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All BioThane Products
purple and yellow biothane collar for Fi Series 3 with brass hardware
Fi Series 3/3+ BioThane Collar - Brass Layered Design
Fi Series 3/3+ BioThane Collar - Brass Layered Design
Fi Series 3/3+ BioThane Collar - Brass Layered Design
Fi Series 3/3+ BioThane Collar - Brass Layered Design
Fi Series 3/3+ BioThane Collar - Brass Layered Design
Fi Series 3/3+ Brass Layered Collar with key features outlined on a white background
Fi Series 3/3+ BioThane Collar - Brass Layered Design
eight biothane color samples from the core collection - chili red, persimmon, flamingo, poppy, goldenrod, green apple, sage, & forest green
eight biothane color samples from the core collection - teal, ocean, blueberry, lavender, violet, plum, caramel, & black
eight biothane color samples from the seasonal color collection - red, coral, bluebird, granite, magenta, periwinkle, midnight & olive
brindle colored dog wearing black and purple biothane dog collar for Fi Series 3 with brass hardware
graphic showing the available styles of Ft Series 3 BioThane Dog Collars
purple and yellow biothane collar for Fi Series 3 with brass hardware

Fi Series 3/3+ BioThane Collar - Brass Layered Design

$103.94

Fi Series 3/3+ sits securely on top of the collar band (unit sold separately).

Solid Brass Sport (Quick Release Buckle)
Choose layered end link accent color

The end link accent pieces hold the Fi Unit end links in place and add a pop of color to your collar. Example shown is sport; brass collars will have brass hardware.
Choose layered end link accent color

The end link accent pieces hold the Fi Unit end links in place and add a pop of color to your collar. Example shown is sport; brass collars will have brass hardware.

Additional Customization

Add a strap keeper

$8.66

Add a strap keeper

Adds a pop of color and keeps the tail end of the collar neatly in place.
Choose a color Red
Limited Edition
Total: $103.94

WATERPROOF

STINK PROOF

EASY TO CLEAN

LIFETIME GUARANTEE

Fi Compatible BioThane Collar (Brass Layered Design) - Strong, Comfortable, and Built for Adventure

Adventure with total peace of mind. Our Fi Compatible BioThane Collar is handcrafted to pair seamlessly with the Fi Series 3/3+ GPS tracking unit (sold separately), giving you real-time location data, activity insights, and rugged durability in one collar.

Why you’ll love it:

  • Layered design - Fi unit rests on top of the collar band (not directly on your dog’s neck) for comfort.

  • Solid brass hardware - classic, rust-resistant, and ideal for water-loving dogs

  • Premium BioThane® - waterproof, stink-proof, lightweight, and wipes clean after any outing

  • Custom style - 15+ colors, with optional accent colors for Fi end links and strap keeper

  • Lifetime guarantee - made to last and backed against material or workmanship defects

The Fi Series 3/3+ unit offers long-lasting battery life, GPS + satellite tracking, and fitness insights, so you can track every adventure with confidence. Purchase separately at tryfi.com.

Durable, customizable, and beach-friendly with brass hardware, this collar keeps your Fi secure while giving your pup comfort and style on every adventure.

FEATURED PET GALLERY

Frequently Asked Questions

ABOUT US

We are a woman-run team of positive dog reinforcement professionals on a mission to help dogs and their guardians live their best lives together. Our goal is to help enhance the dog-human bond through products that prioritize connection, safety, and comfort over control.

Read Our Story

Customer Reviews

Based on 7 reviews
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Alyssa Lawlis (Riverside, US)
Best Collars!

I was looking to upgrade my dogs’ original Fi collars and boy did I. They’re beautiful and turned out exactly like I imagined. Also super durable and easy to clean-both requirements for my high energy/maximum chaos mixed breeds. Highly recommend!

User picture User picture

Thank you for taking the time to leave a review! We are thrilled to hear that our Fi Series 3 BioThane Collar exceeded your expectations. We strive to provide both durability and style for our furry friends. It's great to know that your dogs are loving their upgraded collars. Thank you for recommending us to others. Happy adventures!

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Olivia Richards (Lansing, US)
10/10

Absolutely beautiful and sturdy. 10/10 recommend.

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Thank you so much Olivia! (Thanks for the pic too!)

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