Diddo! I wear thin dress socks in flats if I am wearing full length pants. I have several styles of no show socks that cover different amounts of my feet. I also have them in beige and black. Black is handy in the black flats if a little peeks out! Sandals, if my feet aren't comfy naked in them I don't buy them. I think if i need socks for warmth it is probably too cold for sandals. Natasha, thanks for the reminder about sun burns on the feet. I always put sunscreen on the top of my feet before putting bare feet into any footwear. I use a 30 SPF because my fair skin burns fairly quickly. Another thing, if you wear socks in your flats, it is hard to switch to bare feet. your sock feet will stretch the shoes a tiny bit, then when you wear them with bare feet you may get rubbing and a blister, the no show socks help with that.