Gradual compression, Helps stimulate blood flow, Helps reduce swelling on flights, Unisex.

Medium:

• USA Men's 6-9
• Women's 8-11, (EU 39-43)

Large:

• USA Men's 9-12
• Women's 11-14, (EU 43-47)

Please note that no exchanges or refunds will be permitted on men's and women's undergarments or socks.