Moshi has released the Zefyr 13”, which it claims is the world’s slimmest active MacBook cooler.

According to a press release the Zefyr has a high-thermal conduction interface compound, which enhances heat dissipation by providing a direct heat conduction path between MacBook's bottom casing and Zefyr's cast aluminium heat sink.

The thermal interface compound is soft and compressive to ensure complete contact with the MacBook. Heat accumulated in the heat sink is then expelled through the sides by a USB-powered fan. It means that the MacBook can run at peak performance level by keeping all critical components cool and stable. It also reduces excessive noise by lessening the load of MacBook’s internal fan.

Moshi claims that MacBooks with Zefyr operate at an average of 10 degrees F lower while running demanding applications such as HD video playback.

It also works with the new MacBook Air.