Large pieces of wool underlay (Presteigne LD8)

Useful for suppressing weeds? This material has been under a kelim for at least 20 years but I would not recommend as underlay as it is now attractive to moths. Seems to be made of recycled wool on a man-made fibre mesh - see close-up pic. Pieces measure 575cm x 110cm (reckon about 5% to have been damaged by moths) and 575cm x 130cm (no moth damage visible). Folded and ready to be taken away.