A profile member (20, 40, 60) of a window sash for an outwardly opening window assembly, said profile member (20, 40, 60) comprising: - an outer element (21, 43) which comprises: - a surface which is in contact with a portion of the outer surface of a window pane when assembled, - a flange (24, 42) which extends at least partially underneath the window pane when assembled and - means for attaching mounting hardware to said outer element (21, 43), - a thermally resistive element (23, 41, 62) which is connected to said flange (24, 42) of said outer element (21, 43) at a location between the plane of the inside surface of the window pane and the plane of the outside surface of the window pane and which extends past the plane of the inside surface of the window pane when assembled, and - an inner element which is connected to said thermally resistive element (23, 41, 62) and which comprises a surface which is in contact with a portion of the inside surface of the window pane when assembled, characterized in that the connection between the thermally resistive element (23, 41, 62) and the flange (24, 42) of said outer element (21, 43) is arranged along a connection plane (33, 47) which is at an angle to the plane of the window pane whereby the side of the thermally resistive element (23, 41, 62) facing the centre of the window pane extends closer to the outside of the window than the side of the thermally resistive element (23, 41, 62) facing away from the centre of the window pane. - an outer element (21, 43) which comprises: - a surface which is in contact with a portion of the outer surface of a window pane when assembled, - a flange (24, 42) which extends at least partially underneath the window pane when assembled and - means for attaching mounting hardware to said outer element (21, 43), - a thermally resistive element (23, 41, 62) which is connected to said flange (24, 42) of said outer element (21, 43) at a location between the plane of the inside surface of the window pane and the plane of the outside surface of the window pane and which extends past the plane of the inside surface of the window pane when assembled, and - an inner element which is connected to said thermally resistive element (23, 41, 62) and which comprises a surface which is in contact with a portion of the inside surface of the window pane when assembled, characterized in that the connection between the thermally resistive element (23, 41, 62) and the flange (24, 42) of said outer element (21, 43) is arranged along a connection plane (33, 47) which is at an angle to the plane of the window pane whereby the side of the thermally resistive element (23, 41, 62) facing the centre of the window pane extends closer to the outside of the window than the side of the thermally resistive element (23, 41, 62) facing away from the centre of the window pane. - a surface which is in contact with a portion of the outer surface of a window pane when assembled, - a flange (24, 42) which extends at least partially underneath the window pane when assembled and - means for attaching mounting hardware to said outer element (21, 43), - a thermally resistive element (23, 41, 62) which is connected to said flange (24, 42) of said outer element (21, 43) at a location between the plane of the inside surface of the window pane and the plane of the outside surface of the window pane and which extends past the plane of the inside surface of the window pane when assembled, and - an inner element which is connected to said thermally resistive element (23, 41, 62) and which comprises a surface which is in contact with a portion of the inside surface of the window pane when assembled, characterized in that the connection between the thermally resistive element (23, 41, 62) and the flange (24, 42) of said outer element (21, 43) is arranged along a connection plane (33, 47) which is at an angle to the plane of the window pane whereby the side of the thermally resistive element (23, 41, 62) facing the centre of the window pane extends closer to the outside of the window than the side of the thermally resistive element (23, 41, 62) facing away from the centre of the window pane.