A resilient hydrophobic foamed polymer obtained by reacting a mixture of an isocyanate terminated urethane prepolymer and a polyisocyanate (A) with aqueous material, said prepolymer being relatively hydrophilic and the reaction product of a molar excess of a polyisocyanate (B) with a polyetherpolyol having from 15 to 50% by weight of oxethylene content, said aqueous material having a water content between about 15 to 150% by weight based on said prepolymer, the amount of said polyisocyanate (A) ranging between about 5 to 15% by weight based on said prepolymer, said polyetherpolyol being selected from the group consisting of (a) the addition polymerization product of a starting material, ethylene oxide and another epoxide and (b) a mixture of at least two of the following: (1) The addition polymerization product of a starting material and ethylene oxide; (2) the addition polymerization product of a starting material and an epoxide other than ethylene oxide; (3) the addition polymerization material, ethylene oxide and another epoxide, and said starting material being selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol; dipropylene glycol; butylene glycol; hexylene glycol; glycerol; trimethylolethane; trimethylol propane; 1,2,6-hexanetriol; pentaerythritol; alpha -methylglycoside; sorbitol and sucrose.
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