R21 5-1/2 x 15 x 93" KF INSUL 77.5 SQ. FT. | R-21 High Performance Fiberglass Kraft Faced Batts
5-1/2" x 15" x 93"
8-pcs. per bundle
77.5-Sq. Ft. per bundle
"R'' stands for resistance to heat flow. The higher the R-value the greater the insulating power.