Royalex
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Royalex is a composite material, comprising an outer layer of hard acrylonitrile butadiene styrene plastic (ABS) and an inner layer of ABS foam. The two layers are bonded by heat treatment.
Royalex is used for the manufacture of canoe hulls. Royalex is far lighter, more resistant to uv sun damage and has greater structural memory than other plastics used for this purpose. The flipside to this is that you will pay more for Royalex than traditional roto-molded hulls.