These Memoi Crystal Sheer knee highs are 12 denier and model MS-709. They are similar to the Melas Crystal Sheer 12 denier pantyhose. These have an invisible reinforced toe and a silky sheer leg. I have found most people want a little bit thicker knee high than the skin color pantyhose they wear if they wear 12 denier in pantyhose. A lot will take the Memoi MS-715 at this link: https://hosieryandsockoutlet.com/collections/knee-highs/products/memoi-light-support-knee-high-30-den-ms-715
The standard size fits best on a narrow leg and the queen size fits best on an average or wide leg.