Swiftwick may have just developed the ultimate cycling sock. The Olefin Four Aspire utilizes a Nobel Prize-winning fabric called Olefin, which makes it lightweight with incredible breathability and superb abrasion resistance. Goodbye cotton! So long polyester! There's a new fabric king in town. Best of all, the production of Olefin has less environmental impact than most polymers because it leaves very little waste and is easier to recycle than most synthetic fibers. Aside from that fantastic fabric, the Aspire is just a well-designed sock. It has a linked toe, meaning there's no annoying seam over the toe box. The four-inch compression cuff promotes blood flow to your feet, thus improving circulation and increasing performance. A 200-needle construction is the highest you'll find in any sock, which creates a softer, denser, more durable sock. In other words, buy Swiftwick and you'll buy fewer socks—it's that simple.