List of Pertinent Information for "Highway 21 Heated Gloves": 1. The article discusses the proper fitting of Highway 21 heated gloves. 2. Suggests using a soft tape measure to find the approximate size. 3. Measurement starts at the forehead, one inch above the eyebrows, and continues across the largest portion of the back of the head. 4. Cross-reference the measurement on a helmet size chart to determine the appropriate size. 5. If a soft measuring tape is not available, a string or phone charging cord can be used with a ruler. 6. The Radiant heated gloves from Highway 21 provide 2-3 hours of warmth to the hands. 7. Gloves are powered by two lithium-ion battery packs, each the size of a short stack of business cards. 8. The gloves have plus and minus buttons for temperature control and an LED-lit display. 9. A single charge is enough for most urban commutes. 10. The gloves are waterproof with a Hipora liner. 11. They are warm and weatherproof even without the batteries installed. 12. Gloves have touchscreen compatible fingertips. 13. Knuckle protector and dual wrist and cuff closures are included. 14. Each pair comes with a zippered carrying case, a dual charger, and two batteries. 15. Replacement batteries are sold separately.