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The GEL-CUMULUS 20 has been totally reimagined with an emphasis on weight reduction whilst maintaining performance and ride. A two layered, full ground contact midsole provides a smooth transition while the top layer of FlyteFoam Propel is best in its class for bounce/ rebound and liveliness underfoot. This material is an energetic foam formulation that provides supreme bounce thanks to a unique elastomer compound. The GEL-CUMULUS 20 is the lightest to date.