What do you use for a ground mat to step on?

[mcspin50]

A 2.5ft long piece if reflectex works for me. I edge it with duct tape for durability. It's multipurpose. It's in my pack around my water bladder for insulation, under my butt when the rock, ground, tree, or chair is cold, under my back or feet when I have a cold spot and on the ground under my hammock if I need to step on it.

I like the idea of a multipurpose item. Think I'll give this one a try. Thanks lilprincess.