Round the Clock 149 Sizing Chart Background to Round The Clock. Round The Clock hosiery was established in 1945 at the end of World War II in the United States when the first seamless Nylon hosiery was manufactured. The invention of Nylon by Dupont Corp. induced the creation of various brands of hosiery, including Round The Clock. While seamless hosiery already existed prior to WWII, they were not manufactured through the use of Nylon but rather through Rayon. For over 60 years now, Round The Clock has been one of the most popular brands of hosiery in the world. Their hosiery have gathered the attention and retained the loyalty of women who have found their hosiery to be affordably comfortable and durable. Women love their hosiery for its perfect fit and its color selections. Round The Clock carries a vast and an everchanging variety styles of hosiery, especially pantyhose. All of their hosiery continue to be manufactured in the United States. With seamless pantyhose being one of their popular styles since 1945, their seamless pantyhose have gained an awarded recognition by women who carry an inherent passion towards pantyhose. Today, Round The Clock hosiery can be seen and purchased in many brand name department stores. The most popular seamless hosiery made by Round The Clock is style 137 pantyhose which has a girdle at the top. This style of pantyhose can be purchased below. EZHosiery.com is proud to bring forth this brand into our collection and share their hosiery with you. We hope you like their hosiery too! Please note that if you are purchasing even number of pairs(2prs, 4prs, 6prs...) of the same Round The Clock style hosiery, please type in "rtc" in the coupon code section (case sensitive) when checking out to receive the appropriate discount. This discount does not apply to style 137.