HEAT SOCKS SET XLP ONE - CLASSIC Powered by high capacity, lithium-ion Battery Packs, Hotronic's Heat Socks XLP ONE offer three (3) base level settings for comfort and warmth maintenance while Boost Setting 4 offers an extra blast of heat when needed. The Heat Socks Set XLP ONE - Classic Include: Battery Packs XLP ONE (2 each) Recharger XLP (1 each) Heat Socks XLP PFI 50 - Classic (1 pair) Heat Sock Product Features: Includes 2 Lithium-Ion Batteries US and European Charger 70% Nylon/20% Spandex/10% Marino Wool Machine Wash/Air Dry Fantastic Wicking Ability Consistent Heating Power Perfect for Diabetics or People with Reynauds Syndrome Heat Sock Product Specification: BATTERY PACK XLP ONE: Weight: 76 grams / 2.68 ounces Height: 25 mm Width: 70 mm Depth: 35 mm Cell Count / Type / Capacity / Energy: 1 cell / Li-Ion / 2900mAh (nominal) / 10.4 Wh (nominal) Battery Pack Voltage: 3.6V (nominal) Temperature Range when Charging: +10 to +30 \xB0C / +50 to +86 \xB0F Operating Temperature: -20 to +30 \xB0C / -4 to +86 \xB0F Ideal Storage Temperature: -20 to +20 \xB0C / -4 to +68 \xB0F Charging Time: Approximately 5 - 6 h RECHARGER XLP: Voltage Input Range: 100V to 240V AC Voltage Output Range / Current: 5V DC / 3.1A Operating Temperature / Humidity: +10 to +30 \xB0C / +50 to +86 \xB0F +20% to +85% relative humidity (no condensation) Base Unit Dimensions (withOUT Plug Adapter): 54 mm x 54 mm x 27 mm Power Cord(s) Length (Base Unit to Plug End): 156 cm Weight (withOUT Plug Adapter): 5.1 ounces Weight (with Plug Adapter 120V): 5.3 ounces Weight (with Plug Adapter 240V): 5.6 ounces HEAT SOCKS XLP: Material composition: 74% Nylon 20% Elasthan 6% Merino Wool Possible Sizes: S, M, L and XL Care: Machine washable up to 30 \xB0C (86 \xB0F) / Air dry Hotronic Keeps Feet Warm: HOW FEET BECOME COLD: When colder outside temperatures are detected, the nervous system restricts blood flow to the extremities to maintain the body's core temperatures. The toes (and other extremities) quickly become uncomfortably cold. Other factors aggravate the situation such as impossibly cold and poorly fitting footwear, physical activity levels, individual physiology, and improper selection, use, and care of socks. Also, the presence of moisture (damp socks, wet footwear) increases thermal transfer significantly. This causes heat to escape more rapidly and cold to penetrate faster. HOTRONIC KEEPS FEET WARM: By providing a base level temperature at the toes, Hotronic's Heating Element blocks and neutralizes the penetrating cold keeping the blood circulation open while maintaining comfort and warmth in the feet. Hotronic's Heat Socks XLP ONE offer three (3) base level settings for comfort and warmth maintenance while Boost Setting 4 offers an extra blast of heat when needed Simply slip the heated insoles into your footwear or pull the Heat Socks onto your feet and plug them into the rechargeable Battery Packs. Then fine tune the temperature setting to 1, 2, or 3 for comfort and warmth maintenance. WHEREVER YOU GO: Whether planning for a brief outing or a long term journey, Hotronic's Heat Socks XLP ONE are easy to use in all types of footwear. Use while skiing, snowboarding, bicycling, horseback riding, fishing, and during other cold-temperature activities. FITTING PERFORMANCE: Hotronic's Heat Socks XLP ONE begin with BootDoc's Power Fit Socks created in a wool blend with a soft, gradual pressure distribution to enhance comfort and warmth in a performance fit. The Power Fit Index (PFI) indicates the overall level of gradual pressure distribution woven into each pair of BootDoc's Power Fit Socks. PFI 30 designates a gentle pressure distribution while PFI 90 classifies as strong and is therefore only found in BootDoc's performance series. ERGONOMICALLY DELIVERED HEAT: Hotronic's Heating Element starts within the Sock's double cuff which securely holds the Battery Pack in place. Ergonomically attached to the outside of the Sock for added comfort, the Element then positions along the lower leg, wraps around the Achille's and under the arch, and ultimately delivers heat to the toes and ball of foot. Simply pull the Socks on, align the upper cuff with the BootDoc logo in front, position the Heating Element underneath the toes and ball of foot, and connect the charged Battery Pack. Ready for added comfort and warmth! SINGULARLY POWERFUL: Hotronic's new Battery Pack XLP ONE is powered by a single lithium-ion battery. With more raw power in ONE battery than any other complete Battery Pack in Hotronic's collection, the XLP ONE delivers the heat and duration needed when used with Hotronic's Heat Socks XLP! And, with Hotronic's focus on reliability and longevity, the XLP ONE maintains up to 90% of a full charge and 90% of its initial capacity after two years of nonuse! All with ONE purpose in mind. Keeping feet warmer. Longer. CONSTANT HEATING POWER: Hotronic's electronic design provides Constant Heating Power from the Battery Pack to the Heating Element throughout the heating duration. In conventional designs, power output drops when the charge level drops. Hotronic optimizes the heating power for the best possible experience from start to finish. SETTINGS FOR COMFORT & WARMTH: Hotronic's Battery Pack XLP ONE provides three (3) Constant Heating Power Settings for comfort and warmth maintenance. A fourth Setting (Boost Setting 4) offers an extra blast of heat when needed and is timed to reset to Setting 3 in three (3) minutes. Presshold- and-release the Power Button to select the desired Setting. Easy to read LED lights indicate the Setting selected and when power is on or off. RECHARGING SIMPLE SMART: Wherever one goes worldwide, simply connect the Battery Pack XLP ONE to the Recharger XLP and the current charge level is indicated on the Battery Pack within seconds. As recharging continues, the Battery Pack LED lights indicate when the charge level reaches 25%, 50%, 75%, and a full charge at 100%. Hotronic XLP One PFI 50 Heated Ski Socks