The MFS Vakuum models combine sturdy leather uppers that provide durability and stability with extremely comfortable and adaptable memory foam linings. Proprietary memory foam molds perfectly to the entire foot for a near-custom fit. Gore-Tex Stretch lines the heel area, eliminating any seams that could otherwise cause blisters or hotspots. The footbeds are equipped with memory foam, which adapts to the feet, providing excellent protection and support.