I bought this to speed up the process and reduce stress at TSA checkpoints. I have a 30-31" waist and bought a 34" belt and it fits perfectly. I saw another review that said they are a bit short, which they seem to be. With this guide I got the perfect belt that actually looks better than I thought it would. I thought it would look a little rough and I would only wear it on travel days but I tested it at the office a few days before my last trip and it looks ok/ok with the added bonus that the metal buckle doesn't rattle. I have a TSA pre-check so this worked fine for my outbound flight from the US but I was flying home from Vancouver BC and they forced me to take it from that airport because even a plastic strap would be recognized by a full body scanner and she has to check whether I'm trying to hide something. I'm not sure if this will be the case if I'm flying domestic with pre-clearance. , for the price I am very satisfied.