>>>3ft x 25ft (1 roll of 3ft x 25ft) >>>SOLID 30 pounds per 1000 roll, double sided SOLID foil radiant barrier. solid heavy duty radiant barrier reflects heat back at the source instead of absorbing it like traditional fiberglass insulation It can reduce heat transfer from an attic to a living space by 50%, creating a more comfortable living space Non-toxic, non-carcinogenic, fiber-free, safe to handle and does not require protective clothing or respirators to install. Easy to install and maintenance free, cuts easily with utility knife or scissors and installs easier than fiberglass. Simply staple, nail or glue into place! No mess, and no itchy fibers! Waterproof, Not affected by moisture or humidity. Inhibits condensation. WATERPROOF AND WEATHERPROOF. Non-flammable, flame retardant Saves energy by reducing the stress on heating and cooling systems, keeping your home warmer in the winter, and cooler in the summer. It can reduce utility bills substantially all year round.