“R value” is a measurement of thermal resistance – basically, how well something does at insulating. Larger R values mean better insulation, which translates to lower heating and cooling costs. Sivoia QS Triathlon insulating honeycomb shades have a fantastic R value – as high as 4.3. A typical double-pane window has an R value of 2.0, so adding a Sivoia QS Triathlon shade can significantly increase the insulation of a window.