Thermally insulating packaging medium 200 comprises a cotton pad 210 with in a cover 220, the pad comprising a plurality of layers 212A, 212B connected by needlings. The pad may have a uniform density of needling or a patterned density of needlings with regions of higher 214B and lower 214A needling density. The cotton fibers of the pad may have a mean diameter from 10um (10 micron) to 65um, or from 10um to 25um (25 micron). The cover may be formed from cellulosic fabric which may be cotton, viscose, rayon, jute, flax or hemp. The cover may comprise water impermeable sheet with moisture transmission apertures. The sheet material may be polyester or polyethylene. A thermally insulated package may comprise the medium and a pre-chilled product. The product may be a foodstuff or medical product. Also claimed is a method of delivering pre-chilled products.