How did Habitat make one of it's most beloved shoes even better? Habitat lined the inside of the upper and the removable insole of the Men's Lark Mid Frost Protection Shoe with wool to turn the tables on ol' Jack. When Mr. Frost blows a chill through the streets and parks of your region, you can stand tall on your deck with the power of moisture-wicking natural fibers on your side. And wool is 'au naturale' so it blends perfectly with Habitat's commitment to attaching recycled rubber vulcanized soles that are skate- and earth-friendly.