To put it in to perspective, a reel of resistance heating wire long enough to make 3 heated gillets is around 9 quid from Maplins.
A length of curly lead suitable for a heated vest, a fiver at most.....and if they're using simple 17 or so amp coax cable, a lot less.
A convertible din plug, £2.50....and a suitable gillet to sew the gubbins all into, a tenner or less at wholesale....plus a few quid for thread, connectors, heatshrink etc etc
Yes, it's eminently possible that these will be fine, and you're not paying for the big brand name.....presumably it's some little cottage industry ) or even better from a financial point of view, imported Chinese stuff) in which case, it could be EXCELLENT.
I have two heated vests.....one Rosie wears the one I made and one by Keis that I use
One is home made, BY ME......it cost under 20 quid for the complete kit from Ebay, which I sewed into a lined gillet that I already had, and attached a plug from an auto factors onto, via a curly cord I ripped off a binned electric shaver.
The Keis one cost around £90 IIRC, and TBH, it's shyte......my home made one is better, warmer and has been more reliable
This specific one you're talking about, TBH I have no idea, but personally I wouldn't let the price put me off.........and you have 14 days under the distance trading laws to check it out and send it back if the quality is a bit pants.
FWIW, I priced up making them myself, here on this forum, a year or two back......for commercial small scale sale....I didn't go for it for other reasons, but I do know that I could make you a heated vest for that and still make a profit
EDIT....if you do a Google search on 'how to make a 12v heated jacket' or something similar, you'll find exact specs and instructions on how to make one.......the big advantage of doing it yourself (I found) is that YOU can design in where the hot spots are......My DIY one for example has extra heated loops around the kidneys and around the neck, as that's where I felt I needed most heat.
You can trim the wire easily to make it hotter over smaller areas, or lengthen it to make it generally cooler but to cover more area......you can even do the maths and use wire of different resistances to make a REALLY hot vest, at the cost of power consumption from the bike.
Then, if you're feeling clever, you can add a controller by using a bog standard dial syle rheostat (potentiometer switch, whatever) mounted on the dash, or use any number of off the shelf 'power switches'.
It ain't rocket science
