Refillable Hand Warmer by Zippo®. Color: Black. When you're outdoors, you're focused. Whether hunting, fishing, camping, or simply enjoying ice time with your buds, you don't want distractions like cold hands. Zippo's new and improved filling process for its hand warmers keeps you in the game! Fill the cup. Light the burner. Done! Up to 12 hours of heat for your hands and fingers. Now get back out there.