A composition, characterized in that said composition comprises the following components: a. an isocyanate mixture, comprising: a1) an aliphatic and/or alicyclic isocyanate monomer, and a2) an aliphatic and/or alicyclic isocyanate trimer, wherein the mass ratio of said monomer to said trimer is in a range of 3:1 -200:1; b. a polymer polyol mixture, comprising: b1) a first polyether polyol having a number average molecular weight of not less than 3000 g/mol, wherein said first polyether polyol is obtained by the polymerization of a component comprising ethylene oxide, and said first polyether polyol has an ethylene oxide content of 5-20 wt.%, based on the amount of the component for preparing said first polyether polyol as 100 wt.%, b2) a second polyether polyol having a number average molecular weight of not less than 3000 g/mol, wherein said second polyether polyol is obtained by the polymerization of a component comprising ethylene oxide, and said second polyether polyol has an ethylene oxide content of more than 60 wt.%, based on the amount of the component for preparing said second polyether polyol as 100 wt.%, and b3). optionally, a third polyether polyol having a number average molecular weight of not less than 500 g/mol, wherein the mass ratio of said first polyether polyol to said second polyether polyol is in a range of 4:1-100:1, and the amount of said third polyether polyol is not more than 20 wt.%, based on the amount of said polymer polyol mixture as 100 wt.%; c. an isocyanate-reactive group comprising compound having a number average molecular weight of 32-400 g/mol; d. a catalyst; e. a foaming agent; and f. optionally, an additive; wherein the isocyanate index of said composition is in a range of 70-120. a. an isocyanate mixture, comprising: a1) an aliphatic and/or alicyclic isocyanate monomer, and a2) an aliphatic and/or alicyclic isocyanate trimer, wherein the mass ratio of said monomer to said trimer is in a range of 3:1 -200:1; a1) an aliphatic and/or alicyclic isocyanate monomer, and a2) an aliphatic and/or alicyclic isocyanate trimer, b. a polymer polyol mixture, comprising: b1) a first polyether polyol having a number average molecular weight of not less than 3000 g/mol, wherein said first polyether polyol is obtained by the polymerization of a component comprising ethylene oxide, and said first polyether polyol has an ethylene oxide content of 5-20 wt.%, based on the amount of the component for preparing said first polyether polyol as 100 wt.%, b2) a second polyether polyol having a number average molecular weight of not less than 3000 g/mol, wherein said second polyether polyol is obtained by the polymerization of a component comprising ethylene oxide, and said second polyether polyol has an ethylene oxide content of more than 60 wt.%, based on the amount of the component for preparing said second polyether polyol as 100 wt.%, and b3). optionally, a third polyether polyol having a number average molecular weight of not less than 500 g/mol, wherein the mass ratio of said first polyether polyol to said second polyether polyol is in a range of 4:1-100:1, and the amount of said third polyether polyol is not more than 20 wt.%, based on the amount of said polymer polyol mixture as 100 wt.%; b1) a first polyether polyol having a number average molecular weight of not less than 3000 g/mol, wherein said first polyether polyol is obtained by the polymerization of a component comprising ethylene oxide, and said first polyether polyol has an ethylene oxide content of 5-20 wt.%, based on the amount of the component for preparing said first polyether polyol as 100 wt.%, b2) a second polyether polyol having a number average molecular weight of not less than 3000 g/mol, wherein said second polyether polyol is obtained by the polymerization of a component comprising ethylene oxide, and said second polyether polyol has an ethylene oxide content of more than 60 wt.%, based on the amount of the component for preparing said second polyether polyol as 100 wt.%, and b3). optionally, a third polyether polyol having a number average molecular weight of not less than 500 g/mol, c. an isocyanate-reactive group comprising compound having a number average molecular weight of 32-400 g/mol; d. a catalyst; e. a foaming agent; and f. optionally, an additive;