The Heat Sock Set XLP 2P BT Surround Comfort is the pinnacle in warmth, performance, and longevity.Combining a pair of HOTRONIC XLP 2P BT Battery Packs with the Soft Compression and Surround HeatingElement of the Surround Comfort sock, and then allowing control via a Bluetooth App, HOTRONIC raisesthe bar with convenient Constant Heating Power when needed most - in the cold!

FEATURES:

• Reduced size and weight with increased capacity andlongevity
• 4400 mAh capacity offers a category-best 18 hours ofconstant heating power
• Bluetooth app controls the Battery Pack from anysmart phone
• Merino wool helps wick moisture away from feet andpromote warmth
• Surround Heating Element envelopes the toes
• Safe, stable, and reliable. Just what one would expectfrom HOTRONIC
• Compression: soft – PFI 50, 10 – 15 mmHg
• Material: 74 % nylon, 20 % lycra / spandex, 6 % merino