A polyurethane foam comprising the reaction product of at least: a) at least one isocyanate component having a free NCO content from 20 to 30 % and comprising the reaction product of at least: a1) from 50 to 70% by weight of the isocyanate component of one or more isocynates having a combined composition by weight of from 10 to 35 % of 2,4'-methylene diphenyl isocyanate and from 65 to 90 % of 4,4'-methylene diphenyl isocyanate; a2) from 10 to 30 % by weight of the isocyanate component of one or more polymethylene polyphenylisocyanate having a number average molecular weight of 320-500 and an average functionality of from 2.2 to 3; and a3) from 10 to 25% by weight of the isocyanate component of one or more polyether polyols having a number average molecular weight from 6000 to 8000, a polyoxyethylene content from 45 to 70 % by weight of the one or more polyether polyols, and a primary OH content of 50 to 80 %; and b) at least one polyol component comprising: b1) from 30 to 45 % by weight of the polyol component of one or more polyether polyols having a number average molecular weight from 5000 to 7000, a polyoxyethylene content from 10 to 20 % by weight of the one or more polyether polyols, and a primary OH content of 70 to 90 %; b2) from 35 to 50 % by weight of the polyol component of one or more polyether polyols having a combined number average equivalent weight from 1500 to 1900, a polyoxyethylene content from 10 to 25 % by weight of the one or more polyether polyols, and a primary OH content of 70 to 85%; and b3) from about 5 to 20 % by weight of the polyol component of one or more polyether copolymer polyols. a) at least one isocyanate component having a free NCO content from 20 to 30 % and comprising the reaction product of at least: a1) from 50 to 70% by weight of the isocyanate component of one or more isocynates having a combined composition by weight of from 10 to 35 % of 2,4'-methylene diphenyl isocyanate and from 65 to 90 % of 4,4'-methylene diphenyl isocyanate; a2) from 10 to 30 % by weight of the isocyanate component of one or more polymethylene polyphenylisocyanate having a number average molecular weight of 320-500 and an average functionality of from 2.2 to 3; and a3) from 10 to 25% by weight of the isocyanate component of one or more polyether polyols having a number average molecular weight from 6000 to 8000, a polyoxyethylene content from 45 to 70 % by weight of the one or more polyether polyols, and a primary OH content of 50 to 80 %; and a1) from 50 to 70% by weight of the isocyanate component of one or more isocynates having a combined composition by weight of from 10 to 35 % of 2,4'-methylene diphenyl isocyanate and from 65 to 90 % of 4,4'-methylene diphenyl isocyanate; a2) from 10 to 30 % by weight of the isocyanate component of one or more polymethylene polyphenylisocyanate having a number average molecular weight of 320-500 and an average functionality of from 2.2 to 3; and a3) from 10 to 25% by weight of the isocyanate component of one or more polyether polyols having a number average molecular weight from 6000 to 8000, a polyoxyethylene content from 45 to 70 % by weight of the one or more polyether polyols, and a primary OH content of 50 to 80 %; and b) at least one polyol component comprising: b1) from 30 to 45 % by weight of the polyol component of one or more polyether polyols having a number average molecular weight from 5000 to 7000, a polyoxyethylene content from 10 to 20 % by weight of the one or more polyether polyols, and a primary OH content of 70 to 90 %; b2) from 35 to 50 % by weight of the polyol component of one or more polyether polyols having a combined number average equivalent weight from 1500 to 1900, a polyoxyethylene content from 10 to 25 % by weight of the one or more polyether polyols, and a primary OH content of 70 to 85%; and b3) from about 5 to 20 % by weight of the polyol component of one or more polyether copolymer polyols. b1) from 30 to 45 % by weight of the polyol component of one or more polyether polyols having a number average molecular weight from 5000 to 7000, a polyoxyethylene content from 10 to 20 % by weight of the one or more polyether polyols, and a primary OH content of 70 to 90 %; b2) from 35 to 50 % by weight of the polyol component of one or more polyether polyols having a combined number average equivalent weight from 1500 to 1900, a polyoxyethylene content from 10 to 25 % by weight of the one or more polyether polyols, and a primary OH content of 70 to 85%; and b3) from about 5 to 20 % by weight of the polyol component of one or more polyether copolymer polyols.