The DeFeet Aireator model feature Aireator mesh weave over the top of the foot for breathability. Made from CoolMax EcoMade the socks feature a 6 single layer cuff and the original air-flow design for breathability durability wicking and air permeability. - A.D. Key Features: DeFeet Aireator Socks 6 single layer cuff Original air-flow design Breathable and durable design Wick sweat away Air permeable