They actually held up fairly well. I think you can see from the pic that my cheeks are pretty red. It was cold. Like about -2 deg C with a brisk wind.
But my hands were fine. I tried them first with a basic stretchy dollar store mini glove inside. No cold issues whatsoever. Not sweaty. You could feel a cool pocket inside the glove. The metal brake handle was cold, never became un-cold, just not as frigid.
Went around the neighbourhood making scout deliveries. Probably out for around 40 mins. So a lot of stopping and starting as the kid went from house to house. I cooled down. But hands never got cold.
For about a block on the way home, i used no glove inside the mitts. That was also fine. My hands werent cold to the bone. And the hands do slip in and out of the mitt easier.
The mitt has a narrow black alpaca liner on the inside. I wanted to try a tight fit right against the hand for better insulation. You can still feel cold against the skin, but again not bone numbing.
The brake handle does poke thru the liner. But that's the good thing about knitting. it has kind of built in chinks so there's lots of give.
I could have tried tightening off the draw strings to keep more cold out. I didnt really get a chance before the ride was over.
I like how the knit mitt gives you a lot more colour options, which is what i wanted.
The thing i'm not sure is sustainable is the length of time to make it. If I were to sell, i'd like to keep the price $50 or less. but i think with the extra yarn in the liner and the time to make and stitch together, i wouldnt make money on it.
If you could get the same results from a knit as you go double layer, like thru Fair Isle stranding, that might cut time. But the patterning is less mindless than i'd like it to be. I wonder if simply weaving an a layer on the wrong side might do it. not tricky, but extra time.
Back to simple pattern Fair Isle. I might have to give up the band i wanted for duplicate stitch personalization. But that would have taken extra time anyway.
I'm also not sure right now how it does for snow or rain repellent. It's not going to be as repellent as plastic, but it might do okay for snow, and get you most of the way home dry in a light rain.
More mulling required, I think.