I am rather tall so I chose the Queen size.  The package had "OS/XL"....does this mean Queen?? Dunno. Being the optimist I put them on and they definitely need a garter belt to hold them up.  Most importantly (yuck-factor for me), even with a garter belt the hose didn't fit snug around the ankle to calf part so they have a more footed PJ look in that area than the sexy high-heeled lower leg look :(! Perhaps the regular 30" would have fitted better around the ankle, but they would've been knee high