The best replacement for closed cell is open cell foam.

The best alternatives to closed cell are rated as following:
★★★★★  open cell foam
★★★★★  open cell insulation
★★★★  open cell foam insulation
★★★★  open cell
★★  open cell spray foam insulation
★★  open cell spray foam
★  open cell spray insulation
  open cell polyurethane foam
  open foam
  open cell wetsuits
  icynene

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