Cocoon microfleece mummy liners sleeping bag dark petrol description micro fleece is lightweight and compact fine microfibers transport humidity quickly to the surface the material dries extremely fast and is practical in wet conditions cocoon microfleece mummyliners can be used as comfortable liners or summer sleeping bags they maintain good insulation while still being lightweight the microfleece mummyliner dark petrol is the more lightweight version for the microfleece mummyl