If you intend to sail
offshore, get one with a built in
safety harness.
Some models will have metal rings for the teher attachment point. Some will have soft loops that serve the same function.
Do not mistake the large plastic buckles (shown in the Mustang
photo you posted) for a real
safety harness.
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Since you do not want to buy the most expensive PFD on the market, here is what I recommend for you.
I recently wore one of these for 30 days straight, while sailing offshore and cruising
Newfoundland. It was comfortable.
This brand (CREWSAVER) and model (Crewfit 40) has some good features to consider:
Crewsaver Crewfit 40 Pro USCG - Automatic with Harness
Automatic Inflation
40 pounds of inflation (more buoyancy is better, this has more than cheaper competitors and some more expensive models from competitors). More buoyancy is important for lifting your
head higher out of the
water, especially if you are wearing heavy foulweather
clothing and sea boots or are heavier yourself.
Soft harness loop in front (see the blue loops in
photo below), for attaching a safety tether when needed. I prefer soft loops like this, rather than metal rings.
Numerous optional accessories designed for safety, such as straps, spray hoods, etc.
Reputable brand.
Lightweight, small diameter when folded, low profile form factor for comfort. Not bulky.
Fabric used is not abrasive, helps comfort.
Very nice construction, quality materials, easy open zipper closure.
Clear window to view the gas device status. This is important to check occasionally. I once saw a crew
member wearing a PFD that showed RED status (not usable) and they were not aware of this until I pointed it out to them.
Street
price = $169 at Defender when on
sale. May be $179 off
sale.
Options:
Hood $16
Crotch Strap $12
Crewfit 40 Pro USCG | Crewsaver
They have a more expensive (+$50) model called "Ergofit" and some less expensive models too (about $90).
I hope this helps.