U.S. Merino Wool: We source our 100% U.S. grown merino wool exclusively from sheep raised by American farmers on American farms. Merino wool keeps you cool in the summer and warm in winter. Targeted full-density cushioning provides impact protection to shin while providing warmth. Ventilation Channels allows for air flow to remove moisture Seamless Toe creates a totally flat connection in the toe box, reducing bulk and eliminating blister-generating friction. Comfort Compression helps reduce foot fatigue The lightweight Waitsfield strikes a balance between warmth, comfort, and performance. Its temperature-regulating, while multi-paneled, targeted cushioning in traditional problem areas delivers just the right amount of padding without adding fit-altering volume to your ski boots.