I have been frustrated finding a consistent fit and quality in the stores.  I have bought the same size from the same store on the same day and had some too tight and some too big.  I don't have thick thighs and I don't need leg holes that could fit my waist.  The small size worked great for me, very comfortable.

I used to buy these in the stores and can no longer find them around town, so I was thrilled to find these online.  Great product.