An elastomeric polyurethane-polyurea comprising water blown foam having an apparent density in the range 150-700 kg/m 3 measured according to ISO 845 and having a tensile strength measured according to DIN 53504 over apparent density ratio of at least 10 kPa.m 3 /kg, wherein the foam has - optionally urethane hard-block species formed from D equivalents urethane forming isocyanate reactive species having hydroxyl functional groups and a molecular weight < 500 g/mol, and - optionally urea hard-block species formed from E equivalents urea forming isocyanate reactive species having amine functional groups and a molecular weight < 500 g/mol, and - urea hard-block species formed from C urea forming equivalents of water, such that the total number of urethane and urea hard-block species formed from D equivalents urethane forming isocyanate reactive species and E equivalents urea forming isocyanate reactive species over the total number urea of hard-block species from formed from C equivalents water is smaller than 1.4 and calculated as D + E C, wherein the elastomeric polyurethane-polyurea comprising water blown foam is produced from a reactive foam formulation comprising: - an isocyanate composition comprising A equivalents isocyanate compounds, said isocyanate composition having an NCO value in the range 3 up to 50 and a number average isocyanate functionality in the range of 1.8 up to 2.5, - B equivalents isocyanate reactive compounds having a molecular weight > 500 g/mol and a functionality in the range 1.8 up to 2.5, - C urea forming equivalents of water, - optionally D urethane forming equivalents of low molecular weight urethane forming isocyanate reactive compounds containing hydroxyl functional groups and having a molecular weight < 500 g/mol and having a hydroxy functionality in the range 1 up to 8, - optionally E urea forming equivalents of low molecular weight urea forming isocyanate reactive compounds containing amine functional groups and having a molecular weight < 500 g/mol and having a functionality in the range 1 up to 8, and - at least one catalyst compound, wherein - C is in the range of 0.02 up to 0.08 calculated on 100 gram reactive foam formulation, - optionally D is in the range of 0 up to 0.07 calculated on 100 gram reactive foam formulation, - optionally D + E is greater than 0, D + E C is smaller than 1.4, and - the isocyanate index is in the range 75 up to 125, wherein the urea forming equivalents and urethane forming equivalents are calculated as defined in the specification. - optionally urethane hard-block species formed from D equivalents urethane forming isocyanate reactive species having hydroxyl functional groups and a molecular weight < 500 g/mol, and - optionally urea hard-block species formed from E equivalents urea forming isocyanate reactive species having amine functional groups and a molecular weight < 500 g/mol, and - urea hard-block species formed from C urea forming equivalents of water, - an isocyanate composition comprising A equivalents isocyanate compounds, said isocyanate composition having an NCO value in the range 3 up to 50 and a number average isocyanate functionality in the range of 1.8 up to 2.5, - B equivalents isocyanate reactive compounds having a molecular weight > 500 g/mol and a functionality in the range 1.8 up to 2.5, - C urea forming equivalents of water, - optionally D urethane forming equivalents of low molecular weight urethane forming isocyanate reactive compounds containing hydroxyl functional groups and having a molecular weight < 500 g/mol and having a hydroxy functionality in the range 1 up to 8, - optionally E urea forming equivalents of low molecular weight urea forming isocyanate reactive compounds containing amine functional groups and having a molecular weight < 500 g/mol and having a functionality in the range 1 up to 8, and - at least one catalyst compound, wherein - C is in the range of 0.02 up to 0.08 calculated on 100 gram reactive foam formulation, - optionally D is in the range of 0 up to 0.07 calculated on 100 gram reactive foam formulation, - optionally D + E is greater than 0, D + E C is smaller than 1.4, and - the isocyanate index is in the range 75 up to 125, wherein the urea forming equivalents and urethane forming equivalents are calculated as defined in the specification.