We are THRILLED with this harness.
It's super light weight but strong and it fits our Pitties really well. Our white baby has super sensitive skin but she doesn't chafe with the Flagline. Our brindle baby loves wiggling on her back and has slipped out of other harnesses with her antics. She can't escape this one, so we feel like it's a much safer choice. For both babies we've pretty much had to retighten the straps on other harnesses, almost weekly. We haven't had to make a single adjustment to the straps on the Flagline, even after over a month of use.
This is a great product, we couldn't be happier with our purchase and are happy to recommend it (which we have)!