Master Gardener 734 4-Degree Variance Seed & Frost Blanket, White, 6' x 25'Seed and frost blanket provides essential protection by establishing a stable, favorable microclimate by capturing extra heat during the day and slows the loss of stored heat at night. Frost Blanket 'floats' without suffocating, crushing, or breaking delicate plants. This light weight blanket is porous to air, water and nutrients and UV stable to protect crops and plant. Size: 6' x 25' Color: White Protects from light frost, 4 degree variance Frost