I make " chemo " quilts for special folks.( my daughter made me one several years ago). I like to use high loft polyester batting,and lightweight fleece for the backing. The size is personalized: the height of the human,plus 12 inches to add for tuck under feet. The width of the human,plus tuck under - 18 inches. You may need to add for fluffiness -of- human factor. Then make it into quillow format or as tote bag to use while going to and from chemo,doctors etc. be sure to choose something bright colored,hopeful etc,