Two foldamer strands, which possess chiral amide pendants but imperfect helical handedness, were linked by an achiral (metallo)salen tether, leading to a remarkable enhancement of helical stability and helix-sense excess as a result of the intramolecular hydrogen-bond networks along the entire dimeric foldamer strand; the Mn-II salen complexes catalyzed an asymmetric epoxidation reaction.