I have very wide feet and a high instep. The only shoes I can run or walk on my treadmill in without hurting my knee are Nike Free Flyknits. My feet are so wide and "tall" that I've got runners (like for nylons) in the tongues. I cannot fit socks inside these shoes with my feet. But I've got a messed up toenail and the friction of bare feet inside my shoes wasn't helping. So I thought - why not try those disposable socks they give you in the shoe stores to try on shoes. I figured, the worst that could happen would be they would slide down in the heel, but they would hopefully be so thin that it wouldn't be uncomfortable.

These don't slide down in the heel! Since I got them, when I sometimes almost forget to put them on, I notice how awful my shoes feel on bare feet. How did I stand it!? Even the sewed together part at the toe is soft enough it doesn't bother me wherever it lands. Though I don't know how much they're really helping my toe.

They're not sturdy and are definitely one use only. But they're such a relief for my poor feet that don't fit into shoes.