The cap contains shampoo and a light conditioner, so your hair will feel refreshed and clean whilst looking shiny and strong. Use warm or cold to get that fresh, warm and clean feeling after each application. The cap can be placed in the microwave for 20 seconds if you want to use it warm, or straight from the bag cold. The caps have an elastic band at the bottom to stop anything dripping on to your neck during the wash. For those times when we can't get to a hot bath or shower - these caps are a close second place.