Why High Density Polyethylene (HDPE) instead of aluminium?
Durability - HDPE is a lot tougher, with high impact and dent resistance and much better abrasion resistance*
Lighter material - Aluminium weighs nearly 3x as much as HDPE for the same thickness
Lower friction surface - Superior sliding over shingle and rocks, giving the ability to run a boat across dry land or push slowly through a rock garden
Recyclable - Manufacturing waste is locally reprocessed into farm drainage pipe, and hulls can be recycled.