en-us Product Description: New elastic design with front snaps. 25pct smaller, more stable, does not slide, increased comfort level, smaller electrode area. Compatible with all Polar Heart Rate Monitors except Protrainer XT, Protrainer XT Cycle, XTrainer, S510, S520, S625x, S710, S720i, S725x, S725, CS100, CS200, CS200cad, RS200 and RS200sd. 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