The Swiftwick Performance Four Quarter running sock is a lighter version of Swiftwick's successful Performance Run sock line.

• Knitted at 200 needles, Swiftwick running sock has the highest stitch density you'll find in any running sock on the market today. Benefits to you include a softer, denser, and more durable sock.
• Extra compression (21.1 mmHG) promotes blood flow which increases your performance by reducing foot and leg fatigue.
• Heavy use of the high performance fiber, Olefin, moves moisture like a champ and has a very low friction coefficient.
• Second-skin feel prevents shifting or bunching, eliminates the risk of friction blisters, and makes your shoe fit more comfortably.

Swiftwick Aspire Running Sock Specs

Sock Fibers:

84% - Nylon
10% - Olefin
6% - Spandex

Made in the USA