Based in the Great Lakes region, family-owned Instant Heat Packs offers an alternative to electric heating pads. Instant Heat Packs are reusable and get hot without a microwave—and in fact without electricity. Just “click” the little disc that floats inside the non-toxic gel, and the entire pack heats up instantly to 130 degrees Fahrenheit. The packs provide comforting warmth for up to two hours each time. Perfect to give relief to stiff or aching necks, shoulders, backs, and even hands and joints.