- Speedline is polyester/PBT
- PolyFlex is Polyester/Spandex
Speedline stretches less than PolyFlex, a Speedline swimsuit will not fit as many body types as a PolyFlex swimsuit.
Speedline is more chlorine resistance than PolyFlex, a Speedline swimsuit will last longer in the water than a PolyFlex swimsuit.
A Speedline and a PolyFlex swimsuit unlined may be transparent.
Speedline and Polyflex fabric snags when in contact with rough surfaces.
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