Hippo Hands / generic handlebar muffs are so much more effective than any kind of heated gloves or grips...
Hippo Hands + ordinary leather ropers (heated grips off and wings removed for this test) are better - on my hands, on my commute - than Zero monster gauntlets + heated grips + wings. A LOT BETTER.
I started the ride with my medium winter gloves, but my hands were SWEATING. It was 20F, and my hands were sweating. I only had the leather ropers with me out of habit. Even those were almost too warm. I was impressed.
dat
sax
man