The Frankford Leather Company Alpina Men's lambswool ionsole works great in your boots or shoes. The 100% real lambswool insole which includes the natural properties of lambswool provides warmth and breathability to keep your feet cozy and dry. The anti-slip latex backing provides long-lasting comfort. The insoles are not bulky and can be trimmed if needed.  Please note that packing may vary with this product.