From the one and only Sock Guy:

SockGuy's SGX™ socks are designed with the elite athlete in mind and features our exclusive Elite Performance Formula, a blend of polypropylene, nylon and spandex. The new SGX™ sock line provides a compression fit, performance ribbing, enhanced ventilation and a reduced friction profile. These socks feel great, look great, and with SockGuy's signature Stretch-to-Fit sizing and reinforced toe & heel, SGX™ socks perform like no other.

Guaranteed to be the most comfortable performance socks you'll ever wear.
Our SGX socks feature:
• Compression ribbing cuff helps prevent fatigue by increasing blood flow
• Mesh upper for maximum airflow ventilation
• Snug arch support hugs foot for maximum comfort and virtually zero-slip
• Streamlined friction-free sole: go longer and play harder with no pain