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Check out these collections.

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
Collar size chart with size categories and fit ranges 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

$101.54

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

$8.46

Add a strap keeper

Adds a pop of color and keeps the tail end of the collar neatly in place.
Choose a color Chili Red
Limited Edition
Total: $101.54

WATERPROOF

STINK PROOF

EASY TO CLEAN

LIFETIME GUARANTEE

The ultimate BioThane® dog collar designed for Fi Series 3 and 3+ GPS trackers. This premium BioThane® collar features a layered design with classic brass hardware, perfectly sized to hold your Fi tracker securely. Fi tracker is not included and must be purchased separately through https://tryfi.com/. 

Our Fi Series Brass Layered Collar is handcrafted with genuine BioThane® material and premium solid brass hardware. The layered design creates a secure pocket for your Fi GPS tracker while maintaining a sleek profile. Waterproof, stink-proof, and easy to clean, this collar is built to last through every adventure.

Why you'll love it:

  • High quality solid brass hardware
  • Layered design specifically for Fi Series 3/3+ trackers
  • Layered design allows Fi tracker to sit on top of collar band
  • Made from Genuine BioThane® – waterproof, stink-proof, and easy to clean
  • Available in multiple widths and sizes
  • Customizable with your choice of colors
  • Handmade in Oakland by our all-women team

Get the Perfect Fit 🐶

Collar sizing varies by product and is not universal. 

Incorrect sizing is the #1 reason for collar returns.

To ensure the best fit, carefully measure your dog's neck or existing collar. Our Collar Sizing Demo is located at the end of the product photos.

Questions about sizing or need a custom size? Contact us before placing your order.

Note sure which collar type to choose? Learn more about our full range of BioThane® dog collars.

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

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