It's important to use the gauge on your pump to make sure your board is not over-inflated. An over-inflated board risks damaging the construction of the board, causing bulges or tears to start from within. A PSI of 12 will be enough for most riders, but we recommend a PSI of 15 for heavier riders. Do NOT leave your board inflated and unattended in the heat and/or direct sunlight for long periods of time. Always deflate and roll your board, storing it in a dry, temperature controlled environment when not in use.