Physix Gear Sport Compression Running Socks for Men & Women Plantar Fasciitis - 2PAIR BLK ORNG S/M

Looking for a lighter thin made compression sock. Are they thick or thin?

The photos say 20-30mmhg compression, but the description say 15-20mmhg...which is it?

I’m a women’s size 8.5-9 (9.5 in running shoes). What size should I purchase since I fall into both categories? I don’t have narrow or wide feet.

Is this FSA eligible?