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Check out these collections.

All BioThane Products
blue and green apple biothane collar for the Fi Series 3 Sport Layered Design on white background
Purple and poppy biothane dog collar for the Fi Series 3 in our sport layered design
Purple and poppy biothane dog collar for the Fi Series 3 in our sport layered design laying flat
teal and plum biothane dog collar for the Fi Series 3 in our sport layered design laying flat
blue and green apple biothane collar for the Fi Series 3 Sport Layered Design on white background laying flat
Purple and poppy biothane dog collar for the Fi Series 3 in our sport layered design
teal biothane dog collar for the Fi Series 3 in Sport Layered Design
Fi Series 3/3+ Sport Layered Collar in Blueberry and Green Apple BioThane on a white background with key product features outlined
Collar size chart with size categories and fit ranges on a white background
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
graphic showing available styles of the Biothane Collar for the Fi Series 3
close up of grey dog outside wearing the Fi Series 3 BioThane Collar - Sport Layered Design
close up of grey dog outside wearing the Fi Series 3 BioThane Collar - Sport Layered Design
tan dog wearing a purple and brown Fi Series 3 BioThane Dog Collar in Sport Layered Design
tan dog wearing a teal and green apple colored Fi Series 3 BioThane Dog Collar in Sport Layered Design
tan dog wearing a teal and pink Fi Series 3 BioThane Dog Collar in Sport Layered Design
blue and green apple biothane collar for the Fi Series 3 Sport Layered Design on white background
Bestseller

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

$60.00

Rugged layered sport style that pairs Fi security with lightweight durability (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.

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 sport 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 Sport Layered Collar is handcrafted with genuine BioThane® material and ultra secure Duraflex® quick release buckle 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:

  • Ultra secure Duraflex® quick release buckle hardware
  • Layered design specifically for Fi Series 3/3+ trackers
  • 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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