The Summit Sock with the 6" cuff is our top-of-the-line and lightest "thin" sock and features Repreve® Sorbtek® fiber. Made from recycled water bottles, Repreve® Sorbtek® fiber wicks and breathes exceptionally well. Other features include an imperceptible, no-feel toe seam and 360 degree Aireator® mesh weave venting. The Summit is a sock that every cyclist will want to have along for the ride. THE SPECS: 6” tall compressive comfort cuff No-feel toe seam 360 degree Aireator® mesh weave venting 60% Nylon, 37% Repreve®/Sorbtek®, 3% Lycra®