Memoi Spot on Basics cotton sweater tights are model SP-3405. These ribbed cotton tights are very economical. Regarding sizing, they run a little bigger than some other brands of cotton tights and a little bigger in the foot. To get another idea of the sizing, I know that a girl/woman who is 5'4" and about 115 lbs. can fit comfortably into the size Average after they go into the dryer. To view the girl's sizes go to the Girl's section of the website.