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A crosslinked composition for use as a sheath layer of cable is obtained from polymer blend having ethylene vinyl acetate copolymer (EVA), nitrile rubber (NBR) and crosslinking agent. The polymer blend further has a reactive polymer containing at least one nucleophilic or electrophilic functional group and a reactive compound selected from amphiphilic compound containing at least one nucleophilic or electrophilic functional group that can chemically react with nucleophilic or electrophilic functional group of the reactive polymer.