Cold Feet

I've got a sock problem. The numbers just don't add up. Way too many foot warmers, none of which are pairs. I hold them up side by side, at various angles and in various lights, they look identical, but when I put them on there are very slight, very subtle, almost imperceptible differences: one is too soft, the other too long; one is too baggy, the other too scratchy; one has stitching, the other a pattern. And I spend the whole day walking around feeling all unbalanced. It's very odd.