Do you mean Tech Flex? It might be the black mesh material your looking for. Cool stuff, kind of like the old "chinese finger" game that expands when you push it together then as you stretch it out it tightens right around your wire or hose, they have all kind of colors. Parts express has it
http://www.partsexpress.com/webpage....TOKEN=63687370
So does McMaster Carr
http://www.mcmaster.com search for sleeving or go to page 735 of the catalog...they have some high temp stuff also.