FROST KING 1"x3"x25' Fiberglass Pipe Wrap With Vapor Barrier. It is 1" thick and has a R-value of 3.3. Suitable for 1/2, 3/4, 1 inch pipe. It resists vapor and has a temperature rating of 0 to 250 degree F. CSA certified and UL listed. Includes plastic vapor barrier overwrap. Insulate pipes in exposed areas and prevent sweating. Ideal for over-wrapping electric heat cable kits used to prevent water pipe freezing.