Consistently slip off my heel

These socks do not stay up, regardless of the type of shoe I wear. I wear a size 11 shoe, but even my wife found these socks small for her size 8 foot. I like the light fabric, but that means little when they won't stay up. Really disappointed in this brand. Also, they are not 'no-show'. I can see them when I wear boat shoes or athletic shoes. Weird claims for a product that has few positive features.

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