About This GalleryThese beautiful Pultruded Fiberglass windows from Marvin are meant to last! Marvin has designed the Infinity Fiberglass product with the architectural feel of traditional wood windows. Fiberglass will not rot, warp, chip or peel like other windows. These windows come pre-finished from factory on the exterior and interior but can be painted or stained to match your custom colors. Fiberglass is 8X stronger than vinyl and does not require those bulky frames which reduce your glass size.