Twisted stitches form diagonal lines of texture on this hot water bottle cover. Siân Brown’s design has a wide ribbed neck, which is cinched in using a plaited tie that’s threaded through a row of eyelets. It is knitted in Isle Aran, a soft, woolly blend of Shetland and Bluefaced Leicester wools, which comes in 20 classic shades inspired by the Shetland Isles.