The design enhanced K-1000 Series is based on Korkers original sandal from nearly a half century ago. Korkers original sandal quickly established itself as the market standard and was known for its superb quality and versatility. The greatly improved K-1000 maintains those Korkers long standing traditional values in the market place. The K-1000's are lighter in weight, more flexible and have a molded tread design to increase traction. The lace and web design allows the K-1000 sandals to fit easily over bulky, insulated boots or any special footwear. Replaceable "push through" spikes for increased longevity We Strongly suggest trying on Korkers before making a purchase to ensure proper fitting. All of Korkers Sandal Products are made to strap over your shoe or boot. **********HOW TO FIT KORKERS********* Cinch the Korkers strapping device so that it snugly presses against your shoe or boot.