Reflectix 48-inch by 10-feet bubble pack insulation. This reflective insulation is for use in a crawl space, attic, wall, metal buildings and post and frame structures. The material is fiber-free, environmentally safe, easy to install and lightweight. Each layer of foil is bonded to a tough layer of polyethylene for strength. Beneath is two inner layers of bubble pack resist heat flow, while a center layer of polyethylene gives additional strength.