I am already a fan of TrionZ and I love the look of the new duo loop, however I have found I’m between sizes the small is just slightly too tight, I will exchange for the next size up but suspect that may be slightly to large as I prefer a tighter fit without stopping my circulation. As I said before I do believe this product delivers the benefits it claims, my old TrionZs are still going strong a and I seem to feel calmer when wearing them.