A Japanese lingerie company has manufactured a solar-powered bra.

The “Photovoltaic-Powered Bra” comes with a detachable solar panel that can produce enough energy to power an iPod or mobile phone. It is also environmentally-friendly and made of high quality organic cotton.

Unfortunately, the bra is still in the concept stage and has two drawbacks: it’s not waterproof and it’s ineffective unless worn as outerwear.

It comes in sizes 10 gb-150 gb.