Odtmger 7 Pair Compression Socks for Women & Men 15-20 mmHg is Best Support for Athletic Running Cycling Nursing,Travel

15-20mmhg or 20-30 ?? Description and “about the product” have different values?!

What is the maximum temperature these should be washed at without causing shrinkage or loosing stretch please? I'm less bothered about colour loss.

I stand all day at work, will these help wit the swelling in my feet from having arthritis in my toes?

My feet are size 5 uk but I have chunky calf muscles, which size would be best?