Marvin Windows have several different options available, one of these options is their Fiberglass/ Wood products. The Marvin Elevate™ windows are a Pultruded fiberglass exterior with a Pine wood cap stock interior. They have 6 exterior colors to choose from and 3 interior finish options. Elevate™ Fiberglass clad wood windows and door are quite possibly the perfect materials for the NW environment. They are durable, strong, stable, low-maintenance and efficient. Elevate™ windows and doors made with pultruded fiberglass outperform roll-form aluminum, vinyl, and vinyl/wood composites in virtually every measurable category. While other windows might bend, break, or crack over time, Elevate™ windows hold strong and perform under great stress without showing age or wear.