Learn more› By Ingrid Skjong and Amy Roberts We’re testing the Lululemon Double Roller, Yes4All High Density Foam Roller ... s smooth roll and sturdy construction make for a no-fuss experience.

When it is used in home construction—maybe as a marketing tactic—it’s not typically referred to as foam in ... at R-13 and concrete block at about R-3. On top of the high R-value rating ...