Terramed Just Think ComfortTerramed Advanced Graduated Compression Leggings Women - 20-30 mmHg Footless Microfiber Leggings Tights

I am 5'9 and weigh 138. my legs are long and skinny. should i follow the size chart and go with a large or should i go with a medium? suggestions?

Do they slide down?

is the fabric soft or clammy like regular panty hose? I have used the futuro brand compression stockings and those feel yucky on the skin.

What is the fabric content?