Product details:

Matts sewer blanket helps guard your septic system against frost and freeze up, without the use of electricity. The sewer blanket is staked to the ground in the fall and easily rolls up in the spring for storage. Matts sewer blanket can be used below grade, at grade, or on mound systems. It is waterproof and allows for shedding of late fall rain. It holds the yearly fall snow for added insulation.