ThorlosWomen's Experia Xccu Thin Cushion Running Low Cut Socks

The picture for electric purple shows 3 socks priced 29.95. is this for 3 pairs?

I have the women’s Experia sock with the number 11 on the top of the sock. Is this a small of medium size??

Shoe size 10 1/2 is what size socks

What size sock should I order if I wear a Womens size 8?