In most areas the winter months in the United States can be harsh. Freezing cold weather or rain find their way through the cracks of your house or building making your space less comfortable than it should be. Foams and fillers were created to fill the voids around window and door framing. Acting as a thermal and sound barrier, foams and fillers expand into small cracks to create a strong seal around windows and doors, so you don?t have to worry about outside air creeping in. These foams and fillers work the same in the warmer months of the year as well, by keeping the warm air out and the cold air in.