The SuperFeet you know and love with a merino wool top layer added. (They start with the SuperFeet Green. That's our favorite, too.) Why add wool? Then your skin is touching a natural material, and it will keep your dogs warmer, drier and happier all year round. For the uninitiated, SuperFeet insoles help adapt the flat midsole of your footwear to your foot. The distinct Superfeet shape helps to stabilize the foot, while the deep, structured heel cup and full-length foam provide support and comfort on every step.