We use aquaplast sheets for our bolus. They are custom formed for each patient during the sim. They mold well, have very little air gap, and I think because they are white, we have never had a problem with it going out of tolerance once it is in. Our bolus is 0.5cm and tolerance is 3mm. I had never thought about it before since we used this bolus before we had VisionRT, so I don’t have a comparison.