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Useful composites and methods of using such composites are provided. The composites include an outer layer containing a first polymeric material, an intermediate layer circumscribed by the outer layer and containing a second polymeric material, and an inner layer circumscribed by the intermediate la

Useful composites and methods of using such composites are provided. The composites include an outer layer containing a first polymeric material, an intermediate layer circumscribed by the outer layer and containing a second polymeric material, and an inner layer circumscribed by the intermediate layer and containing a third polymeric material. The inner layer, in combination with the intermediate layer, is structured and effective to reinforce the composite relative to a substantially identical composite without the inner layer. The present composites can be produced using co-extrusion processing.

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What is claimed is: 1. A composite structure having substantially uniform layers consisting essentially of: an outer layer comprising a first polymeric material; an intermediate layer circumscribed by the outer layer and comprising a second polymeric material; and an inner layer circumscribed by th

What is claimed is: 1. A composite structure having substantially uniform layers consisting essentially of: an outer layer comprising a first polymeric material; an intermediate layer circumscribed by the outer layer and comprising a second polymeric material; and an inner layer circumscribed by the intermediate layer and comprising a third polymeric material, wherein the inner layer does not define a hollow space, and, in combination with the intermediate layer, is structured and effective to provide reinforcement to the composite structure relative to an otherwise identical composite structure without the inner layer, wherein the third polymeric material, optionally containing a particulate filler, provides said reinforcement to the composite structure, and wherein the layers of the composite structure are bonded together without the aid of a glue, adhesive, or bonding agent. 2. The composite structure of claim 1 wherein the inner layer defines a reinforcement element. 3. The composite structure of claim 1 wherein at least two of the first, second and third polymeric materials have different chemical compositions. 4. The composite structure of claim 1 wherein at least one of the first, second and third polymeric materials is a thermoplastic polymeric material. 5. The composite structure of claim 1 wherein each of the first, second and third polymeric materials is a thermoplastic polymeric material. 6. The composite structure of claim 1 defining of a member having a length, and the inner layer extending along a major portion of the length of the member. 7. The composite structure of claim 6 wherein the member has a substantially rectangular or substantially square cross-section perpendicular to the length. 8. The composite structure of claim 6 wherein the member has a contoured cross-section perpendicular to the length. 9. The composite structure of claim 6 wherein the member comprises a slat. 10. The composite structure of claim 6 wherein the member is structured as a window covering slat. 11. The composite structure of claim 6 wherein the member is structured as a siding component. 12. The composite structure of claim 6 wherein the member is structured as a paneling component. 13. The composite structure of claim 6 wherein the member is structured as a fence component. 14. The composite structure of claim 1 wherein the outer, intermediate and inner layers. 15. The composite structure of claim 1 wherein the intermediate layer comprises an intermediate foam containing the second polymeric material. 16. The composite structure of claim 15 wherein the inner layer comprises an inner foam containing the third polymeric material. 17. The composite structure of claim 15 wherein each of the intermediate foam and the inner foam is a closed-celled foam. 18. The composite structure of claim 15 wherein the intermediate layer and the inner layer meet at an interface having an irregular configuration. 19. The composite structure of claim 1 wherein the intermediate layer includes an effective amount of a filler. 20. The composite structure of claim 19 wherein the filler includes a wood component. 21. The composite structure of claim 1 wherein the inner layer includes an effective amount of a filler. 22. The composite structure of claim 1 defining member having a length, the wherein intermediate layer is circumscribed by the outer layer along substantially the entire length of the member and the inner layer is circumscribed by the intermediate layer along a major portion of the length of the member. 23. The composite structure of claim 1 wherein the first polymeric material is weatherable. 24. The composite structure of claim 1 wherein the first polymeric material is selected from the group consisting of polyvinylchloride, acrylonitrile/styrene/acrylic polymeric materials and combinations thereof. 25. The composite structure of claim 24 wherein the second polymeric material comprises a different polymeric material than the first polymeric material. 26. The composite structure of claim 25 wherein the third polymeric material comprises a different polymeric material than both the first and second polymeric materials. 27. The composite structure of claim 26 is produced by a single, coextrusion process. 28. A composite structure having substantially uniform layers consisting essentially of a weatherable outer layer comprising a first thermoplastic polymeric material; a intermediate layer circumscribed by the outer layer and comprising a second wood-filled thermoplastic polymeric material; an inner layer circumscribed by the intermediate layer and comprising a third thermoplastic polymeric material, wherein the inner layer does not define a hollow space, and, in combination with the intermediate layer, is effective to reinforce the composite relative to an otherwise identical composite structure without the inner layer, and wherein the third polymeric material, optionally containing a particulate filler, provides said reinforcement to the composite structure; and the composite structure defines a member having a length and a substantially non-hollow cross-section perpendicular to the length, wherein the composite structure does not contain a glue, adhesive, or bonding agent. 29. The composite structure of claim 28 produced by a single, coextrusion process. 30. The composite of claim 28 wherein the inner layer defines a reinforcement element. 31. The composite of claim 28 wherein at least two of the first, second and third polymeric materials have different chemical compositions. 32. The composite of claim 28 wherein the inner layer extends along a major portion of the length of the member. 33. The composite of claim 28 wherein the intermediate layer comprises an intermediate foam containing the second polymeric material. 34. The composite of claim 33 wherein the inner layer comprises an inner foam containing the third polymeric material. 35. The composite of claim 34 wherein the intermediate layer and the inner layer meet at an interface having an irregular configuration.