From the Manufacturer:
A game of water roulette! 1) Strap on the water filled Wet Head; 2) Spin the top and pull out any one of the rods; 3) If you stay dry, pass Wet Head to the next player. Make Wet Head the perfect game for any season by adjusting the amount of water you use to play. Fill Wet Head to the brim when outside in the summer heat. Bring the fun indoors for winter by using a minimal amount of water. Summer or winter, the questions remains the same, "Will you be the next Wet Head?"