Although we’re just a week away from entering the 2018 spring season, there are still places where people are dealing with cold weather daily. As someone whose hands tend to get cold even when the rest of me is fine, I recommend the EnergyFlux Ellipse rechargeable hand warmer. It sports a 5,200mAh lithium-ion battery (up to 500 charges) and two heat settings, each with their own approximate runtimes (depending on ambient temperature, how cold your hands are, etc):

1. Low: 107°F (~6.5 hours) — Indicated by green LED
2. High: 118°F (~5 hours) — Indicated by red LED

When you’re not using it as a hand warmer, you can use the built-in USB port to supply some juice to your phone or other device.

Get it for $35 on Amazon.