An apparatus for cooling, the apparatus comprising: (a) a blown film die operable for producing a flow of a molten film tube; (b) a unidirectional cooling element for receiving the flow of the molten film tube, the unidirectional cooling element having a unidirectional cooling interface comprising a unidirectional cooling gas deflector operable for expelling a cooling gas in a path with the flow of the molten film tube toward a first exit gap and a first exit tip, wherein the first exit gap is defined, in use, between the flow of the molten film tube and the first exit tip, (c) a divergent cooling element for receiving the flow of the molten film tube operably stacked adjacent the unidirectional cooling element, the divergent cooling element having a recessed divergent cooling interface comprising a first cooling member, a second cooling member and a cooling gas deflector, the cooling gas deflector operable for expelling a cooling gas (i) in a path opposing the flow of the molten film tube along the first cooling member toward a second exit gap and a second exit tip and (ii) in a path with the flow of the molten film tube along the second cooling member toward a third exit gap and a third exit tip, wherein the second exit gap is defined, in use, between the flow of the molten film tube and the second exit tip, wherein the third exit gap is defined, in use, between the flow of the molten film tube and the third exit tip, characterised in that the first exit tip is closer to the flow of the molten film tube, in use, than any other portion of the unidirectional cooling interface, in that at least one of the second exit tip and the third exit tip is closer to the flow of the molten film tube, in use, than any other portion of the divergent cooling interface, in that a surface of the unidirectional cooling interface is annularly angled inward toward the flow of the molten film tube, in the direction of cooling gas flow, just prior to terminating at the first exit tip, and in that the second and third exit tips (56, 58) are angled inward toward the flow of the molten film tube. (a) a blown film die operable for producing a flow of a molten film tube; (b) a unidirectional cooling element for receiving the flow of the molten film tube, the unidirectional cooling element having a unidirectional cooling interface comprising a unidirectional cooling gas deflector operable for expelling a cooling gas in a path with the flow of the molten film tube toward a first exit gap and a first exit tip, wherein the first exit gap is defined, in use, between the flow of the molten film tube and the first exit tip, (c) a divergent cooling element for receiving the flow of the molten film tube operably stacked adjacent the unidirectional cooling element, the divergent cooling element having a recessed divergent cooling interface comprising a first cooling member, a second cooling member and a cooling gas deflector, the cooling gas deflector operable for expelling a cooling gas (i) in a path opposing the flow of the molten film tube along the first cooling member toward a second exit gap and a second exit tip and (ii) in a path with the flow of the molten film tube along the second cooling member toward a third exit gap and a third exit tip, wherein the second exit gap is defined, in use, between the flow of the molten film tube and the second exit tip, wherein the third exit gap is defined, in use, between the flow of the molten film tube and the third exit tip, characterised in that the first exit tip is closer to the flow of the molten film tube, in use, than any other portion of the unidirectional cooling interface, in that at least one of the second exit tip and the third exit tip is closer to the flow of the molten film tube, in use, than any other portion of the divergent cooling interface, in that a surface of the unidirectional cooling interface is annularly angled inward toward the flow of the molten film tube, in the direction of cooling gas flow, just prior to terminating at the first exit tip, and in that the second and third exit tips (56, 58) are angled inward toward the flow of the molten film tube.