Purchased the 3.8 cm/medium collar for my 35 kg Swiss Shepherd. It was plenty big enough with heaps of adjustment room. I wouldn't wanted to go to the wider collar as it would have been to wide and uncomfortable. The handle is just the perfect size for gripping, not too bulky or obtrusive. The tactical clip is very solid clasp. Overall it is a substantial collar with a bit of weight. It is not going to be used as my dog's regular collar as I think it is a bit bulky for everyday use. I purchased it especially to use when competing in SprintDog trials because of the handle to extra control of my dog. So far very pleased with it and the quality.

This collar is AWESOME & works like a charm for larger dogs! I got it for my Pitbull & it's worked great! The handle on it is amazing & perfect for managing larger dogs. I love the buckle style on it too. The collar is sewn very well & strongly to hold up. When they say it's triple sewn it is! It's made of really nice neoprene & also a strong nylon material. I highly recommend this collar!

Great quality. Would buy again.