I haven't seen people use them in bottle cages. Mainly because once you start drinking from them, they collapse. It would be hard to secure it when its, let's say, half full. Carrying it in a rear jersey pocket could be an option though.

you mean something like this ?

http://www.arundelbike.com/product/chrono/

I'm talking about vacuum sealed metal bottles that can sit in the sun all day and the water is still cold. I guess from the lack of responses there is no such thing for bikes, which I find odd given the proclivity for expensive gadgets in the triathlon community.

I've seen guys use stuff like this for long distance gravel races and such:

http://salsacycles.com/.../racks/anything_cage

but for the "standard" hydroflask bottles you can probably just bend a normal steel cage to fit.

PM Milesthedog on here. He's experimented with insulated SS bottles. I don't think he got anything to work but perhaps he can give you some insight.