Insulating glazing

A double glazing, comprising:

• a first glass sheet having a first face 1 facing an outside of the double glazing and a second face 2 facing an interior of the double glazing;
• and
• a second glass sheet comprising a first low-emissivity layer on a first face 3 facing the interior of the double glazing and a second low-emissivity layer on a second face 4 opposite the first face 3,
• wherein the first low-emissivity layer comprises a sputtering layer comprising an infrared-reflecting metal layer produced by sputtering,
• wherein the second low-emissivity layer comprises a pyrolytic layer of tin oxide doped with antimony or fluorine deposited by gas pyrolysis,
• wherein the double glazing has a light transmission of not less than 60% for thicknesses of the clear glass sheets of 4 mm,
• wherein at least one of the group consisting of a layer of SiOxCy, a set of layers of TiO2.SiO2, and a set of layers of SnO2.SiO2, is interposed between the second face 4 and the pyrolitic layer,
• wherein at least one protection layer is interposed between the sputtering layer and the first face 3,
• wherein the pyrolytic layer has a thickness of not less than 200 nm and a surface roughness Ra of less than 10 nm, and
• wherein the double glazing has a haze of less than 0.3%.