Made of 100% cotton - Comfortable to wear - The design on the back resembles an American flag - The driver unit is placed in a hidden pocket sewn to the T-shirt and responsible for controlling the flashing by reacting to the loudness of sound - The driver unit has an on/off switch and clip with which you can attach it to your belt - Powered by 4*AAA batteries (not included) - The flashing panel is attached via Velcro and you can remove it and driver unit for washing - The T-shirt Measures 72cm high and 56cm in shoulder width - Perfect for disco-goersparty-goer and so on to highlight your presence