DeFeet Tour De France Aireator White Medium. 45% coolmax DeFeet Tour De France Aireator White Medium. The officially licensed socks of the Tour de France ! X- Large fits Men 7 - 9 / Women 8.5 - 10.5. The DeFeet AirEator is known as the "original air-flow sock" that leads in durability, wicking, drying, and air permeability. En-Duro-Skin construction reinforces the external heel and toe, puncture areas. Achill-E-Shield reinforces high-stress area ! Stayfast cuff provides a secure, durable, dynamic fit. Solez system lets durability and wicking co-exist !