Kalwall has been setting the industry standard for diffused natural lighting systems since it was first introduced globally at the 1958 Brussels World’s Fair. Kalwall window designs provide a more predictable, better quality of usable natural light with superior thermal properties and best-in-industry solar heat gain control. Lightweight, shatterproof and rapidly installed, Kalwall has unrivaled structural integrity. Kalwall is not a plastic, polycarbonate or glass. Rather, the product’s primary element is a structural composite sandwich panel formed by permanently bonding, under heat and pressure, specially formulated, fiberglass-reinforced translucent faces to a grid core constructed of interlocked, structural aluminum/composite, thermally broken "I" beams. It is available in curved or flat options.