Cold mornings start with warm toes when the Hotronic Heat Socks Set XLP 1S BT Surround Comfort EVO goes on. The set combines a pair of heated socks with a pair of XLP 1S BT battery packs, and a Bluetooth app controls the packs from a smartphone. Merino wool in the socks wicks moisture away from the feet and promotes warmth. What Our Gearhead(R) Experts Are Saying:"Over long cold days, the Surround Heating Element kept heat wrapped around my toes. The welded wires let the sock stay seamless, which kept the fit comfortable."