Superfeet took their well-known support and performance and combined it with the equally legendary natural thermoregulating properties of merino wool to create the MerinoGrey Insole. The thick pile of the 90% merino top cover lays over the insole's supportive Foundation foam and Encapsulating Stabilizer System to keep you supported, aligned, and comfortable. Trim these insoles to fit and slip them into any hiking, walking, snowsports, casual, or military shoes to boost their support and deliver cushy, breathable comfort.