R-12 Fiberglas® Insulation. 23" x 47" x 3.5" and covers 150.1 sq.ft. in Space Saver packaging. For 2x4 basement walls. Friction-fit batts are easy to install and offer outstanding thermal performance providing savings on heating and cooling costs. Non combustible. Made in Canada with a minimum 73% recycled glass content, SCS Certified, GREENGUARD Gold certified for indoor air quality and validated to be formaldehyde free.