.5 oz Plant Germination Blanket (12' x 40') Plus Other Sizes In This Listing - LIGHT Frost Cloth Freeze Protection Light Weight, .5 oz. Permeable Fabric. Mainly used for Seed Germination or LIGHT frost protection since it's only .5 oz For colder climates where frost protection is desired, heavier weight fabrics in description below. Excellent microenvironment for newly seeded grass and plantlings Allows Water and Light in, UV Treated, Reusable Can be Left on in Sunny Days Without Fear of Foliage Burn