Ultimate merino wool performance with expanded hear under and over the toe. 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. 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.