We love all of our Tuenne gear- leashes and collars. So happy they have fi compatible collar. We had been looking for a cool collar to pair with the fi unit ans this is by far my favorite. The topographic design is perfect for our little adventure dog but the best thing about this brand is that it's the most durable thing we've found on the market. We go hiking, camping and backpacking so we love that it's nearly impossible to destroy through our rugged adventures. We'll be getting another one for our new pup once we get her fi unit!