The Hello Hottie Heat Patch 3 Pack is a box of three air-activated heat patches from Hello Period, giving up to 8 hours of gentle warmth during your period. There is nothing to charge or microwave. Open the packet, peel off the backing and stick the patch to the outside of your underwear, and it starts warming once it meets the air.

Each patch is slim and discreet under clothing, so it suits work, school, travel and life on the go. No cords, no microwaves and no hot water bottles.