A flexible polyurethane foam comprising the reaction product of: toluene diisocyanate, with an isocyanate-reactive component comprising: (a) from 70 to 95% by weight, based on 100% by weight of component (a) and component (b), of an in-situ formed polyol blend having a hydroxyl number of from 56 mg KOH/g polyol to 250 mg KOH/g polyol, an average functionality greater than 2 and comprising: (i) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether monol having a hydroxyl number of less than 56 mg KOH/g polyol, and containing less than 20% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(i), and (ii) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether polyol having a hydroxyl number of 47 mg KOH/g polyol to about 300 mg KOH/g polyol, an average functionality of greater than 2 to 6, and containing from 5 to 45% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(ii); and (b) from 5 to 30% by weight, based on 100% by weight of component (a) and component (b), of a filled polyol; in the presence of a blowing agent; a catalyst; and a surfactant; wherein the resultant foam has a 90% compression set of less than or equal to 10% as measured by ASTM D3574-11 at an isocyanate index of at least 100 and wherein the isocyanate-reactive component is free of polyether polyols which have a functionality of at least 2 to 8 or less,a hydroxyl number of at least 20to 240 or less, and contain at least 50% of copolymerized oxyethylene, based on 100% by weight of the polyether polyol. toluene diisocyanate, with an isocyanate-reactive component comprising: (a) from 70 to 95% by weight, based on 100% by weight of component (a) and component (b), of an in-situ formed polyol blend having a hydroxyl number of from 56 mg KOH/g polyol to 250 mg KOH/g polyol, an average functionality greater than 2 and comprising: (i) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether monol having a hydroxyl number of less than 56 mg KOH/g polyol, and containing less than 20% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(i), and (ii) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether polyol having a hydroxyl number of 47 mg KOH/g polyol to about 300 mg KOH/g polyol, an average functionality of greater than 2 to 6, and containing from 5 to 45% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(ii); and (b) from 5 to 30% by weight, based on 100% by weight of component (a) and component (b), of a filled polyol; (a) from 70 to 95% by weight, based on 100% by weight of component (a) and component (b), of an in-situ formed polyol blend having a hydroxyl number of from 56 mg KOH/g polyol to 250 mg KOH/g polyol, an average functionality greater than 2 and comprising: (i) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether monol having a hydroxyl number of less than 56 mg KOH/g polyol, and containing less than 20% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(i), and (ii) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether polyol having a hydroxyl number of 47 mg KOH/g polyol to about 300 mg KOH/g polyol, an average functionality of greater than 2 to 6, and containing from 5 to 45% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(ii); and (i) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether monol having a hydroxyl number of less than 56 mg KOH/g polyol, and containing less than 20% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(i), and (ii) from 25 to 75% by weight, based on 100% by weight of (i) and (ii), of a polyether polyol having a hydroxyl number of 47 mg KOH/g polyol to about 300 mg KOH/g polyol, an average functionality of greater than 2 to 6, and containing from 5 to 45% by weight of copolymerized oxyethylene, based on 100% by weight of (a)(ii); and (b) from 5 to 30% by weight, based on 100% by weight of component (a) and component (b), of a filled polyol; a blowing agent; a catalyst; and a surfactant;