I’m still testing this product, but I will say this: it’s TIGHT. My measurement was 9, which I thought would put me well within the Small size range which ran to 9.5. Medium begins at 10. So I should be comfortable in the Small, right? The compression is good, but the band above my elbow hurts if I don’t adjust it every 10 minutes or so. Not easy to do in a sweater or jacket. We’ll see if I keep using it or try another brand.See full review