This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging .eta..sup.5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging .eta..sup.5-cyclopentadienyl-type ligands, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclosed herein provide ethylene polymers with a bimodal molecular weight distribution.