This site has limited support for your browser. We recommend switching to Edge, Chrome, Safari, or Firefox.

Production lead time 1-2 weeks Free US Shipping Over $85

Zoom Purple and black biothane Fi Series 3 collar with brass hardware
Zoom purple and yellow biothane collar for Fi Series 3 with brass hardware
Zoom Blue and coral Biothane Dog collar for Fi Series 3 with brass hardware
Zoom brindle colored dog wearing black and purple biothane dog collar for Fi Series 3 with brass hardware
Zoom close up of brindle colored dog wearing black and purple biothane dog collar for Fi Series 3 with brass hardware
Zoom graphic showing the available styles of Ft Series 3 BioThane Dog Collars
Zoom graphic showing the available colors of biothane

Fi Series 3 BioThane Collar - Brass Layered Design


Adventure with total peace of mind with our waterproof, stink proof, easy to clean BioThane collars, compatible with Fi’s newest Series 3 tracking units (sold separately)! The Fi Series 3 unit features an extra long battery life in a sleek, minimalist design. Fi’s proprietary technology uses GPS and satellite data to provide accurate real time data, as well as fitness and sleep data! 

Our Fi Series 3 Compatible BioThane Collars are available in Sport and Brass styles, Layered or Integrated designs, ¾” or 1” widths, and in 16+ colors, allowing you to design a one of a kind collar that matches your dog's personality and style! Collars do not include the Fi unit. The unit must be purchased separately at Use code HIGHTAILHIKES20 for $20 off your Fi collar activation fee. 

Our Brass Layered Design allows the unit to sit on top of the collar band. You may want to choose this design if you would prefer to not have the unit sit directly on your dog’s neck. All collar styles have been tested for strength and durability. All Series 3 units can be charged without removing the unit from the collar. 

Choose your collar size and preferred colors for the main band and end link accents from the color options shown. Select a strap keeper if desired ($2; will be the same color as your end link accents).  A strap keeper is a loop of biothane between the buckle and D Ring that helps keep the tongue of the collar in place. 

Important: please size your dog properly for their collar before placing an order. There are two ways to size your dog for a collar:

  1. Use one of your dog’s existing collars to determine their measurement. Lay the collar down flat on a tape measure or cutting mat and measure the distance from where the two points of the collar meet when the collar is being worn. 

  2. Use a length of string or a soft cable (like a phone charging cable) to measure around your dog’s neck where a collar would naturally sit. Allow enough space for 2 fingers to fit underneath the collar to ensure that the collar will not be too tight. Transfer the string or cable to a cutting mat or tape measure and check the measurement. Measure several times to ensure accuracy.

Please also watch this video where we review how to size your dog for a collar

Your dog’s neck measurement should ideally fit in the middle of the sizing range of the collar that you choose. Due to the Fi Unit and hardware being built into the collar, Fi collar sizing may be different from our standard collar sizing. Please read the sizing options carefully. If you are between sizes, or not sure what to choose, please contact us. We are always happy to help, or to make your collar in a custom size by request. 

All of our BioThane Collars are waterproof, stink proof and easy to clean! Brass is rust proof, but can develop a patina over time. See our blog post about cleaning your BioThane gear. We do recommend rinsing your gear with fresh water and towel drying after a hike or a trip to the beach. This will help to remove salt, sand, and other grit to help your gear last longer. 

Although our products are guaranteed for life, you are responsible for ensuring the safety of your dog. Please inspect your gear and hardware regularly. Never leave your dog unattended in a crate while wearing a collar. 

Fi Series 3 BioThane Collar - Brass Layered Design


Customer Reviews

Based on 2 reviews
Christine (Atlanta, US)
Looks great. Fi fits very well

This Fi collar is very nice. The Fi fits very close to the collar without any space. I have used other Fi compatible collars where the Fi kind of hangs away from the collar. Looks great too!

So glad you are happy with our designs! Thank you Christine!

JAMES P. (Prescott, US)
Nice collar!

This collar is well made, looks good, and fits great. The color options are nice. The Fi connections are solid, and I really like the layered design for removing the Fi unit for charging. This is second collar we’ve purchased from High Tail Hikes as our pup has grown. I’m sure it won’t be the last.

Thank you James! We are pretty proud of the Fi capable collars! We appreciate you :)