There are a lot of good designs out there. The biggest thing we looked for was having a wide enough belly strap sytem to support an 80lbs pit bull when trying to pull her back into the boat. The ones we saw at the chain pet stores had 1" wide webbing with no real support underneath. WE tried several different brands including Ruff Wear and ended up with the best fit coming from NRS. We did buy a Body Glove brand that ripped out the second trip. It looked nice and fit well.....but what a POS it is.