For my women's size 11 feet, I like Hot Sox. Many department stores sell them. They come in wild patterns and colors and are a thin cotton. The toe seam is minimal, and if it starts to bother me I wear them inside out. They conform well to one's feet because they are so thin. I wear these under workboots and with all my shoes. Department stores also have various cheap socks of the same style, I buy those too. My experience with biking socks is that they are too narrow, too tight, and too short, and the toe seam is very abrasive. That is, smaller in every measurement than regular socks. I tried a few pairs, and had to make a scissor cut in the cuff.

Hot Sox aren't perfect, they are a bit short. If only they made them 2 inches longer they would be better, but they are still better on a bike than anything else I have tried. Thin wool socks are available but I can't wear wool next to my body.