I am in the running athletic footwear industry and have designed an oval shaped part positioned in the midfoot for the pupose of high energy return after deflecting 50-70% when loaded. Pebax 7233 is performing perfectly due to its high flex modulous, energy return, and ability to withstand cyclical fatigue (does not seem to take a set), low crack propagation, etc. The only problem... it's cost prohibitive. What do you think is the best substitute (Nylon 66, 6, 12, 6/12, Hytrel, TPU, etc.) and will it perform close to the Pebax 7233 for less cost? Thanks!
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