Set the iron to a hot cotton setting, do not use steam at any point.
Place the patch in the desired location and cover with a thin piece of cloth. (A tea towel will do, but make sure it isn't stained!)
Press the hot iron onto the patch applying pressure for around 30-60 seconds, making sure you keep the iron still.
Iron the opposite side for around 30-60 seconds to reinforce.
It's recommended to put a few stitches around the edge of the patch to keep it 100% secure over time.
When washing any garments with patches applied, it’s best to wash them as little as possible. If garments need washing, turn them inside out and wash on a gentle cycle.
Do not put garments in a tumble dryer.