Are these the alloy ones or the steel bars?

Interested if alloy - pm sent

Thank you all for your responses. I'll have a look for for a suitable ccf mat and let you know how I get on.

Thanks

Hello, I've got an alpkit numo sleeping mat which for the most part has been grand. However I was using it at the Strathpuffer at the weekend and found it pretty cold, even with a thin foam yoga mat underneath for added insulation. I'd like to do a winter bike packing bivvy and would like to know ei...