Perrenial favorites for DeFeet wool fans, Woolie Boolie's are padded through the entire heel and foot bottom. Sometimes too thick for those who wear their cycling shoes super 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." We say, whether you wear for cycling or not, it's not hard to find plenty of use cases for the Woolie Boolie. For many, these are the ultimate all-around Fall/Winter cycling, outdoor, fitness and casual sock.