Several years ago I scored some very thick Navy surplus socks. 100% pure wool. I can't wear them except with a couple of pairs of boots that are really too roomy for me. They really take up the slack.General slip on boot question. I have a low volume instep, flat foot. Therefor slip on boots tend to be loose. Does anyone have a hack for dealing with this? Adding a foot bed to raise my foot doesn’t really work because it is then too tight on the toes. Cutting the footbed by a 1/3 feels wonky. Tongue pads on the instep sort of work but tend to come off or move when i put the boots on.