Yes, they are just knee socks! No one knows why they brag about them as thigh high socks.
These socks are very short and usually only reach the knees. If you stretch them a bit, they will keep sliding down when you start to walk. They will not stop sliding down until they reach your ankle. Throw them away. Such socks will ruin all your plans, and you may adjust them all night.
These socks are usually very thin. They are almost transparent, the color of your skin shows through the socks, sometimes they look good, sometimes they don't. They won't keep you warm because they can't do it.
Kayhoma thigh high socks are completely different socks. They are more than 28 inches, even if you are 6 feet tall, they can reach 6 inches or more of your knee. They are real thigh socks. They are 150% of the thickness of ordinary socks and can keep your temperature all the time even outdoors.