bllhogg - 2/2/2019 12:49 AM wearing it under gear that is water resistant clothing will delay ignition... wearing it under waterproof clothing with delay ignition even further. "tight" has nothing to do with it. it all depends on when the ignition mechanism hits its limit. if you're serious about wearing your pfd, wear it as the top layer.... use commonsense. yikes I own and have worn both the Mustang and Onyx and definitely prefer the Onyx because the Mustang is heavier and tends to fatigue my shoulders/neck… maybe it's just my body type but I don't have that problem with the Onyx. I've also wondered “is this thing really going to work if I fall in?” My solution has been to simply replace it every three or four years, but still kind of feel like I'm crossing my fingers to a degree... how can you 100% test it? Agree that they can get a little restrictive even on top of light rain gear so I wear it underneath with the front of the jacket or even a sweatshirt partially unzipped. I've been told that if it goes off underneath it can choke so would be interested to hear a real expert's opinion on this subject. Steve, I recommend that you spend the extra money on one so you can wear it all the time. I guarantee that after a couple of months you will notice it as much as your car’s seat belt… it will then only feel odd when you don't have it on. J | 
