Insufficient elastic in heel, slide down

I thought I was purchasing a good product I already own but apparently the quality of this product has gone down hill significantly. I've worn them about 5 times and have decided to throw them away. There is not enough elasticity in the heel/ankle area and they constantly slide down and expose the back of my ankle to my gym shoe which is a pain. So, I either get blisters or bend down and fix my sock when I feel them sliding down... not exactly what I'm looking for in an athletic sock - messed up enough runs that I'm literally putting them in the garbage. Buyer Beware - poor quality.

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