Year 1: Foam and Cordura
Year 2: Rotomolded plastic
Year 3: Aluminum
Year 4: Nylon
Year 5: Thermoformed Plastic
Year 6: Wood
Year 7: Neoprene
Year 8: Minicell
Year 9: Gore-tex
Year 10: Fiberglass
Year 15: Kevlar
Year 20: Carbon
Year 25: Hullivator
Year 50: Wood again
This is a work in progress. Feel free to add, switch around, or refine. 