While these Swiftwick Aspire Twelve Socks may not be what you want for a mid-summer ride in the southern states, their calf length cuffs, along with the multiple knitting patterns, provide a comfortable compression effect that promotes blood flow in the feet and lower legs. And as you might guess, improved vascular performance means reduced fatigue and speedier recovery. And if you like a high tan line, you can't get any taller than these for a cycling sock.The Aspire Socks are created by a 200-needle machine process that yields a high density, seamless knit fabric. The process allows variability in the finished knit of the socks, as different parts meet different performance requirements. For example, the cushioned footbed gives way to the thin channeled upper -- both components playing a crucial role to increase your comfort. When you slip into a pair of Aspire Socks, you'll immediately feel that they're tailored for your feet. The arch band offers snug support in the midfoot, and the Y-shaped heel contour assures no bunching or overstretched feeling in the back. The dense nature of the material all but guarantees durability when combined with the abrasion resistant properties of Olefin, one of the prime components of the foot of the sock. Olefin is a lightweight polypropylene fiber that Swiftwick sources from US manufacturers. Then the socks are created in Tennessee in Swiftwick's own factory, where they can oversee every step of the process to ensure tight quality control. The Olefin wicks like crazy to keep your feet dry, but removing moisture from your skin is only half the story. Olefin is also hydrophobic and will not absorb water, so the moisture transfer is complete all the way to the outside of the sock. You'll stay dry, comfortable, and blister free since the socks move with your feet and minimize (or eliminate) abrasion against your skin.The Swiftwick Aspire Twelve Socks are available in Black and in four sizes from Small to X-Large. It's worth noting that the fibers used in Swiftwick socks are colored during their creation. In comparison to socks that are dyed after knitting, this makes Swiftwick socks stronger and more durable.