One pair is open on a corner. See photo.

This is a set of 3 Silkies Control Top TLC Support Pantyhose in size X-Tall. They are black pantyhose made of nylon, suitable for various occasions like travel, weddings, parties, and everyday wear. The pantyhose feature a solid pattern with a control top for added support. They are designed for women and are recommended to be hand washed only. Made in the United States.