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A hybrid underlayment, includes a thermoplastic making up between 92.0% by volume to 95.5% by volume of the hybrid underlayment. A plurality of expanded microspheres is dispersed through the thermoplastic. The microspheres are expanded to a volume in a range of between 180 square micrometers and 145

A hybrid underlayment, includes a thermoplastic making up between 92.0% by volume to 95.5% by volume of the hybrid underlayment. A plurality of expanded microspheres is dispersed through the thermoplastic. The microspheres are expanded to a volume in a range of between 180 square micrometers and 1450 square micrometers. The microspheres makeup between 1.0% by volume to 7.5% by volume of the hybrid underlayment. The hybrid underlayment is extruded into a flat sheet having a thickness of between 1.0 mm and 2.0 mm and a density from 7 pcf to 25 pcf. A metalized thermoplastic film is laminated to the top surface of the thermoplastic sheet. A pre-stretched laminated oriented mesh fabric is fused to the metalized thermoplastic film.

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1. A hybrid underlayment, comprising: (a) a metalized thermoplastic film having a top side and an opposite bottom side;(b) a pre-stretched laminated oriented mesh fabric fused to at least a portion of the bottom side of the metalized thermoplastic film;(c) a thermoplastic sheet having a top surface

1. A hybrid underlayment, comprising: (a) a metalized thermoplastic film having a top side and an opposite bottom side;(b) a pre-stretched laminated oriented mesh fabric fused to at least a portion of the bottom side of the metalized thermoplastic film;(c) a thermoplastic sheet having a top surface and an opposite bottom surface, the metalized thermoplastic film and the pre-stretched laminated oriented mesh fabric disposed on and coupled to the top surface of the thermoplastic sheet; and(d) a plurality of expanded microspheres dispersed through the thermoplastic sheet. 2. The hybrid underlayment of claim 1, wherein the thermoplastic sheet makes up between 92.0% by volume to 95.5% by volume of the hybrid underlayment. 3. The hybrid underlayment of claim 1, wherein the microspheres make up between 1.0% by volume to 7.5% by volume of the hybrid underlayment prior to expansion of the microspheres. 4. The hybrid underlayment of claim 1, wherein the pre-stretched laminated oriented mesh fabric has a weight in a range of 16 gsm to 28 gsm. 5. The hybrid underlayment of claim 1, wherein the metalized thermoplastic film comprises polyethylene terephthalate. 6. The hybrid underlayment of claim 1, wherein the metalized thermoplastic film has a thickness in a range of 15 microns to 200 microns. 7. The hybrid underlayment of claim 6, wherein the metalized thermoplastic film has a thickness of 50 microns. 8. The hybrid underlayment of claim 1, wherein the metalized thermoplastic film is glued to the thermoplastic sheet with a heat activated glue. 9. A flooring for covering a floor substrate, comprising: (a) a hybrid underlayment that disposed on the floor substrate, the hybrid underlayment including: (i) a metalized thermoplastic film having a top side and an opposite bottom side;(ii) a pre-stretched laminated oriented mesh fabric fused to at least a portion of the bottom side of the metalized thermoplastic film;(iii) a thermoplastic sheet having a top surface and an opposite bottom surface, the metalized thermoplastic film and the pre-stretched laminated oriented mesh fabric disposed on and coupled to the top surface of the thermoplastic sheet; and(iv) a plurality of expanded microspheres dispersed through the thermoplastic sheet; and(b) a plurality of interfacing LVT flooring units, each of which is disposed on the hybrid underlayment. 10. The flooring of claim 9, wherein the metalized thermoplastic film comprises polyethylene terephthalate. 11. The flooring of claim 9, wherein the metalized thermoplastic film has a thickness in a range of 15 microns to 200 microns. 12. The flooring of claim 11, wherein the metalized thermoplastic film has a thickness of 50 microns. 13. The flooring of claim 9, wherein the metalized thermoplastic is glued to the thermoplastic sheet. 14. The flooring of claim 9, wherein the pre-stretched laminated oriented mesh fabric has a weight in a range of 16 gsm to 28 gsm. 15. A floor, comprising: (a) a sub-floor;(b) a hybrid underlayment that disposed on the floor substrate, the hybrid underlayment including: (i) a metalized thermoplastic film having a top side and an opposite bottom side;(ii) a pre-stretched laminated oriented mesh fabric fused to at least a portion of the bottom side of the metalized thermoplastic film;(iii) a thermoplastic sheet having a top surface and an opposite bottom surface, the metalized thermoplastic film and the pre-stretched laminated oriented mesh fabric disposed on and coupled to the top surface of the thermoplastic sheet; and(iv) a plurality of expanded microspheres dispersed through the thermoplastic sheet; and(c) a plurality of interfacing LVT flooring units, each of which is disposed on the hybrid underlayment. 16. The floor of claim 15, wherein the metalized thermoplastic film comprises polyethylene terephthalate. 17. The floor of claim 15, wherein the metalized thermoplastic film has a thickness in a range of 15 microns to 200 microns. 18. The floor of claim 17, wherein the metalized thermoplastic film has a thickness of 50 microns. 19. The floor of claim 15, wherein the pre-stretched laminated oriented mesh fabric has a weight in a range of 16 gsm to 28 gsm.