I bought one of the FiredUP vests for my wife when there was a group buy here a few years ago. I loved it so much I bought another not too long afterwards.
Reality is when you warm your core, your extremities also stay warmer. One of the biggest reasons your arms, fingers, toes etc etc get cold is because your body starts to pull blood away from them when your core body temperature starts to drop. Keep your core warm and blood (and the heat that comes with it) flows freely to all those extremities. The difference is amazing.
The batteries are decent for 1-2 hour rides on high, or longer rides on lower settings. Myself, I made a cigarette lighter adapter for my vest that lets me use it endlessly on high. Coming back from Tail of the Dragon last fall it was a godsend - ran it on full the entire last day and I was toasty.
But yes, because of the way it works it does need to be fit close to your body with no more than 1 layer of fabric (IE, just a Tshirt at most) between it and your skin. It's also very form fitting, which may (or may not) be flattering depending on your build. Thankfully it's hidden under my jacket when I'm using mine LOL.
Reality is when you warm your core, your extremities also stay warmer. One of the biggest reasons your arms, fingers, toes etc etc get cold is because your body starts to pull blood away from them when your core body temperature starts to drop. Keep your core warm and blood (and the heat that comes with it) flows freely to all those extremities. The difference is amazing.
The batteries are decent for 1-2 hour rides on high, or longer rides on lower settings. Myself, I made a cigarette lighter adapter for my vest that lets me use it endlessly on high. Coming back from Tail of the Dragon last fall it was a godsend - ran it on full the entire last day and I was toasty.
But yes, because of the way it works it does need to be fit close to your body with no more than 1 layer of fabric (IE, just a Tshirt at most) between it and your skin. It's also very form fitting, which may (or may not) be flattering depending on your build. Thankfully it's hidden under my jacket when I'm using mine LOL.