The original Aireator was such a solid, versatile platform for a sock that it had to made in wool also. That is exactly what the Wooleator is. Performance cycling and running shoes require a sock that doesnt take up too much space. Cooler temperatures and inclement weather doesnt mean your shoes grow to accommodate thicker socks. You need better insulation in the same space. This is when the Wooleator shines. Since they are so thin, they dont take summers off. Notably, 'Cavendish Signature' Wooleator Hi Top has hits of green to honor the incredible achievement of the Manxman who became the first ever British cyclist to win the Points Classification at the Tour de France and taking home the coveted Green Jersey. This Wooleator can be dressed up, ridden around town or worn on any adventure you can conjure up. An honest four season multi sport sock, the Wooleator is regarded as one of DeFeet's most versatile models. Constructed with the finest American Merino grown within the Rocky Mountain regions of the USA.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.