The Vivaldi board, combined with the Vivaldi screen, has become a key tool in the Pacific Northwest in managing hive temperature and moisture. Designed by John Edwards, this combination, wicks up hive moisture through the Vivaldi screen into the Vivaldi board. The Vivaldi screen increases the surface area of absorption. We use burlap but you can also use sheep wool, cedar shavings or other natural material. You can also provide emergency winter feeding of Drivert sugar directly through the screen. We find that the bees love congregating up in under the Vivaldi screen in winter because it is the warmest spot in the hive.