XR Edge has advanced spacer technology and is available in all NEXT windows and doors. XR Edge’s effectiveness lies mainly in the spacer which separates the two panes of glass in the IGU. Its main role is preventing moisture passing into the IGU, preventing the possibility of internal condensation and fogging. It also creates a thermal barrier between the two pieces of glass. One of the key features is the desiccant is on all 4 sides.