<p>Mobile Warming Pro Heated Merino Socks</p> <p>Medium (M5-8/W6-9)</p> <p>Large (M8-10/W9-11)</p> <p>Extra Large (M10-14/W11-14)</p> <p>Our thoughtfully designed 2 panel heated sock provides up to 11 hours of heat between charges and is made from a merino wool blend for maximum comfort, warmth and natural odor protection. Providing heat above and below the toes for 2x the heat of our regular socks. Stay out all day with the calf length Pro Merino sock.</p> <p>Whether you're in deep in the backcountry or on a winter job site, you can trust our Pro Merino heated socks to provide powerful instant warmth. With expanded heat zones above and below the toes and powered by our high capacity 3.7v Lithium-Ion reachargeable battery, the pro merino calf length sock delivers heat for up to 11 hours on a single charge. Odor resistant merino wool blended fabric provides added comfort and warmth. Toggle between 4 temperature settings from the convenience of your cell phone using Bluetooth wireless control and the MW Connect® app. The integrated zippered battery compartment conveniently keeps the power block in a comfortable position throughout the day, with no need to adjust or worry about them shifting. The perfect blend of high-performance materials and technology to make sure you stay warm, dry, and comfortable no matter what the weather throws at you.</p> <p>Sock Features:</p> <p>• 59% Merino Wool, 34% Nylon, 5% Polyester, 2% Lycra</p> <p>• Heat Zones Over and Under the Toes</p> <p>• Sweatsheer® Moisture Wicking</p> <p>• OdorSheer® Natural Odor Protection</p> <p>• Over the Calf Length</p> <p>• Left and Right design for Added Comfort and Fit</p> <p>• Arch Support</p> <p>• Heal and Toe Reinforcement</p> <p>• Zippered Batter Compartment on the Calf</p> <p>• 4 Selectable Heat Levels</p> <p>• Slim Contoured 3.7v Lithium-Ion Reachargeable Battery</p> <p>• Bluetooth®-Enabled Wireless Control</p> <p>• MW Connect™ Mobile App Compatible available on App Store® or Google Play Store®</p>