This is a pack of pure magic. A scientifically engineered Grid-Relief Technology that uses a mechanical action to create a micro lift in the skin, helping drain the lymphatic system to release biochemicals that cause the itch sensation. Put one on and it lasts for up to 7 days. The cross shape of the tape when stretched across the skin, adjusts the skin to increase lymphatic flow, and help drain the mosquito saliva which is what causes the itch.