This is not an ordinary glow-in-the-dark t-shirt but an interactive model that lets you draw and even write on it. The Lazer Shirt comes with a UV Lazer that charges the t-shirt material which glows in the dark for a while, until it fades out.
In daylight, the interactive item looks like a regular white t-shirt and you can wear it during any activity. You can wash it cold in the machine and wear it at parties. Get it from ThinkGeek.com for $24.99.