A cured composition obtained by curing a curable polymer composition comprising: (a) 3 to 50 wt.% of at least one hydroxyl group containing compound selected from the group consisting of diols, triols, tetraols, polyols, polymeric polyols, and mixtures thereof, wherein each of diols, triols, tetraols, and polyols independently has a molar mass of less than 0.5 kg/mol; (b) 50 to 97 wt.% of a sulfonated styrenic block copolymer comprising a block A, a block B, and a block D, wherein: each block A is a polymer block resistant to sulfonation and selected from polymerized: (i) para-substituted styrene monomers, (ii) ethylene, (iii) alpha olefins of 3 to 18 carbon atoms, (iv) 1,3-cyclodiene monomers, (v) monomers of conjugated dienes having a vinyl content less than 35 mole% prior to hydrogenation, (vi) acrylic esters, (vii) methacrylic esters, and (viii) mixtures thereof, each block B is a polymer block susceptible to sulfonation and derived from a vinyl aromatic monomer, wherein the block B has a degree of sulfonation of > 10 mole%, and each block D is a polymer block resistant to sulfonation and derived from a conjugated diene monomer; and wherein the cured composition is characterized as having: a tensile stress per ASTM D412 of: 6.2 to 30 MPa in a dry state, and 3 to 10 MPa in a wet state after 1 day, both measured as described in the specification; and a Gel Content of > 70%, measured according to Gel Content Test as described in the specification. (a) 3 to 50 wt.% of at least one hydroxyl group containing compound selected from the group consisting of diols, triols, tetraols, polyols, polymeric polyols, and mixtures thereof, wherein each of diols, triols, tetraols, and polyols independently has a molar mass of less than 0.5 kg/mol; (b) 50 to 97 wt.% of a sulfonated styrenic block copolymer comprising a block A, a block B, and a block D, wherein: each block A is a polymer block resistant to sulfonation and selected from polymerized: (i) para-substituted styrene monomers, (ii) ethylene, (iii) alpha olefins of 3 to 18 carbon atoms, (iv) 1,3-cyclodiene monomers, (v) monomers of conjugated dienes having a vinyl content less than 35 mole% prior to hydrogenation, (vi) acrylic esters, (vii) methacrylic esters, and (viii) mixtures thereof, each block B is a polymer block susceptible to sulfonation and derived from a vinyl aromatic monomer, wherein the block B has a degree of sulfonation of > 10 mole%, and each block D is a polymer block resistant to sulfonation and derived from a conjugated diene monomer; and wherein the cured composition is characterized as having: a tensile stress per ASTM D412 of: 6.2 to 30 MPa in a dry state, and 3 to 10 MPa in a wet state after 1 day, both measured as described in the specification; and a Gel Content of > 70%, measured according to Gel Content Test as described in the specification. each block A is a polymer block resistant to sulfonation and selected from polymerized: (i) para-substituted styrene monomers, (ii) ethylene, (iii) alpha olefins of 3 to 18 carbon atoms, (iv) 1,3-cyclodiene monomers, (v) monomers of conjugated dienes having a vinyl content less than 35 mole% prior to hydrogenation, (vi) acrylic esters, (vii) methacrylic esters, and (viii) mixtures thereof, each block B is a polymer block susceptible to sulfonation and derived from a vinyl aromatic monomer, wherein the block B has a degree of sulfonation of > 10 mole%, and each block D is a polymer block resistant to sulfonation and derived from a conjugated diene monomer; and a tensile stress per ASTM D412 of: 6.2 to 30 MPa in a dry state, and 3 to 10 MPa in a wet state after 1 day, both measured as described in the specification; and 6.2 to 30 MPa in a dry state, and 3 to 10 MPa in a wet state after 1 day, both measured as described in the specification; and a Gel Content of > 70%, measured according to Gel Content Test as described in the specification. <EOS>