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The Proof is in the Pudding
The Comet and Spitfire kayaks are made so affordable through the process of blow-molding. The mold set up costs are 5 times higher compared to rotoationally-molded kayaks but the process significantly decreases production time and reduces the blemish rate. If you want to get really techy about it:
The blow molded kayaks are made from High Molecular Weight Polyethylene ( HLMI PE ) vs Low density Polyethylene typically used in the rotomolded kayaks. HMW HLMIPE is about 2 1/2 times stronger than Low density Polyethylene.
Here are the comparative Strengths
High-Density Low density
Tensile Strength(psi) 4,500 1,700
Flexural Strength(psi) 5,800 1,400
Flexural Modulus(psi) 120,000 22,000
Tensile Strength is the pulling strength required to break a given specimen
Flexural Strength is the tensile stress of the outermost fibers of a bent test sample at the instant of failure
Flexural Modulus is a measure of the strain imposed in the outermost fibers of a bent specimen
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