Although the Lifeline jackets are the best on the market IMO, they are not U.S. Coast Guard approved (an issue of high cost of certification and relatively low production volume) it can be a problem if stopped for a 'safety' check on-the-water by law enforcement (better have some of those attractive orange horse-collar ones on-board just to be safe). Also, don't assume that your 'race' jacket or your 'high-performance sport' jacket will automatically turn and float you face-up in case of a bad accident -- it may not. Although they are designed for that purpose, body type, height, weight, clothing, driving suit, etc. may prevent that from happening. The only way to know for sure is to head to the nearest swimming pool, buckle-up and take a full speed running leap (try it several times with several different entry positions). Once you hit the water, go limp (no cheating). If you're not floating on your back, face-up in thirty seconds, that jacket needs to go back to the manufacturer and have them modify the flotation material (if you take pictures or a short video of your swimming pool trials, it will help get the problem solved). Remember, if the jacket has leg straps, those should be very loose so the jacket can ride-up around your neck and under your chin for more support where you need it.