NOVELTY - The thermoformable article (10) comprises a multilayer optical film (12) including an optical stack having alternating layers, which have a birefringent polymer layer and a second polymer layer, a compliant UV-protective layer (14) applied onto a surface of the multilayer optical film, and a durable top coat (18) applied to an opposing surface of the compliant UV protective layer and/or a tie layer (16) interposed between the multilayer optical film and the compliant UV protective layer. The compliant UV protective layer reflects UV light, absorbs UV light and/or scatters UV light.    USE - The thermoformable article is useful as a solar concentrating mirror, which is useful in a solar collection device such as solar cell (claimed) for concentrating a specific bandwidth of light onto the solar cell.    ADVANTAGE - The thermoformable article addresses degradation issues in solar concentration devices, provides specific bandwidths of electromagnetic energy to the solar cell while eliminating or reducing undesirable bandwidths of electromagnetic energy, improves the efficiency and operation of the solar cells, can be formed in various shapes or constructions, and has high mechanical durability, improved impact or abrasion resistance and improved dimensional stability.    DETAILED DESCRIPTION - The thermoformable article (10) comprises a multilayer optical film (12) including an optical stack having alternating layers, which have a birefringent polymer layer and a second polymer layer, a compliant UV-protective layer (14) applied onto a surface of the multilayer optical film, and a durable top coat (18) applied to an opposing surface of the compliant UV protective layer and/or a tie layer (16) interposed between the multilayer optical film and the compliant UV protective layer. The compliant UV protective layer reflects UV light, absorbs UV light and/or scatters UV light, and is a multilayer UV reflective mirror. The article reflects a major portion of the average light across the range of wavelengths that corresponds with the absorption bandwidth of a selected solar cell and transmits or absorbs a major portion of light outside the absorption bandwidth of the selected solar cell. The major portion of the average light across the range of wavelengths represents a value greater than 50%, 70%, 80%, 90% or 95%. The article has a reflectivity of 98% or greater of light corresponding to the absorption bandwidth of the selected solar cell. The compliant UV protective layer and/or any one of the alternating layers include ultra violet absorbers, hindered amine light stabilizers, antioxidants, optical brighteners, fluorescing molecules, nano-scale particles and/or flame retardants. The compliant UV protective layer has an optical density of greater than 4-380 nm. The article further comprises an additional compliant UV protective layer applied to an opposing side of the multilayer optical film opposite to the compliant UV protective layer, or a reinforcing material consisting of injection cladding, corrugation, ribs, foam spacer layers or honeycomb structures applied to an opposing side of the multilayer optical film opposite to the compliant UV protective layer. The article is applied to a substrate such as a polymeric sheet, a glass sheet or polymer fiber composites. An optional ultra-violet absorber is included in the substrate. The multilayer optical film comprises a first multilayer reflective mirror laminated to a second multilayer reflective mirror, where the first and second multilayer reflective mirrors have different reflection bands. INDEPENDENT CLAIMS are included for:    (1) a solar collection device; and    (2) a method of collecting solar energy.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross sectional view of an article with an optional durable top coat layer.    Article (10)    Multilayer optical film (12)    Compliant UV protective layer (14)    Tie layer (16)    Durable top coat. (18)