Vinyl Hotbeds are raised beds with Plexiglas windows to limit the escape of heat (i.e., "cold frames"). Being vinyl, they do not tend to split, peel, or rot like their wooden counterparts can. As to size, depths range from 32 to 36 inches and widths from 72 to 96 inches; slope is usually 18 inches in back to 12 inches in front. The wider hotbeds may have either one or two lids.