CS CELERSPORTCelerSport 3 Pairs Compression Socks for Men and Women 20-30 mmHg Running Support Socks

What is the percentage of nylon, cotton, spandex, etc.? I don't see that mentioned in the product description and that would be very helpful. Thanks

ladies size chart?

What is the Country of origin

My calf is 20 in. What size should i buy?