The original AireatorR is built by cyclists for cyclists. Born in 1992, the AireatorR is the first product that launched DeFeetR and today its still the workhorse of the DeFeetR line. The AireatorR is the undisputed, original airflow design and first sock with a open mesh weave instep hence the name. It was also the first design sock that was customized with a logo, colors, and text. Before the AireatorR, that simply wasn't done. It has been worn to victory in nearly every International cycle race. The AireatorR still leads in lightweight, durability, moisture wicking and air permeability. The Lava style features DeFeet's 6 hi top cuff and is uniquely its own with vividly contrasting, rough drawn lava flows. The word lava comes from Italian, a country steeped in cycling tradition. More than just a sock, Lava boasts a real passion for style and performance. Made from COOLMAXR EcoMade, the eco friendly polyester that comes from recycled plastic bottles. Sizing: Small Women 6 8 Medium Men 7 9 Women 8.5 10.5 Large Men 9.5 11.5 Women 11 13 Extra Large Men 12.