This Catalyst Fermentation System Premium Tank Cover is perfect for home brewers and small - scale brewery owners who want to improve the quality of their beer. Use it during the fermentation process to protect your beer from UV rays and maintain a stable temperature. The cover is made of thick 600D vinyl laminated canvas and is reinforced with cross - stitching. It comes with integrated carrying straps and a quick - view flap. It can cover an entire fermenter, suitable for fermenters with beer loads up to 50 lb.