A perennial favorites of all DeFeet fans, the Woolie Boolie is padded through the entire heel and foot bottom. Sometimes too thick for those who wear their cycling shoes skin tight, Woolie Boolie's are the thickest of the DeFeet cycling socks. Those who love them say "If you can get them in your cycling shoes, they're the best you can own." For many, these are the ultimate all-around Fall/Winter cycling, outdoor, fitness and casual sock. The Woolie Boolie Comp is built on the same burly platform as the Woolie Boolie. It's knit with a soft wool/poly blend yarn composition. It retains all the positives of natural and recycled fibers.