Windshield Covers are made of nylon Silver Laminate, a two-ply laminated fabric developed by Bruce's Custom Covers especially for aircraft protection. The outer material is a medium weight nylon treated for ultraviolet resistance and water repellency. The inner lining is brushed nylon tricot knit. This material is extremely reflective. Tests show that the cabin interior temperature can be reduced by as much as 25 degrees. Silver Laminate is water, ice and snow repellent, yet it is breathable enough to allow moisture to escape from between the cover and the windshield surface. Silver Laminate contains no hydrocarbon compounds which can harm plexiglass windshields and acrylic finishes.