A thermomechanically reprocessable thermoset composite comprising (i) a reinforcement phase comprising fibres, this phase being in a volume percentage comprised from 25 to 70% with respect to the total volume of the composite, and (ii) a matrix phase which is in a volume percentage comprised from 30 to 75% with respect to the total volume of the composite, being the sum of volumes of both phases forming the composite 100%, and wherein the matrix phase comprises a cured epoxy resin in a percentage comprised from 50-100% by weight with respect to the total weight of the matrix phase, and the cured epoxy resin being obtainable by: (a) mixing an epoxide-functionalised resin with a functionality equal to or higher than 2 with a cross-linking agent of formula Ar-S-S-Ar wherein Ar means a ring system from 5 to 14 carbon atoms, the system comprising 1-3 rings, where: the rings are saturated, partially unsaturated, or aromatic; provided that at least one ring is aromatic, the rings are isolated, partially or totally fused, at least one of the carbon atoms forming the aryl radical is substituted by an epoxide-reactive functional radical selected from the group consisting of: -NHR 10, -NH-NHR 10, -CO-NH-NHR 10, -COOH, -SH, -OH,-CO-NHR 10, -NCN-NH-NHR 10, wherein the asterisk denotes the carbon atom through which the epoxide-reactive radical binds to the ring system, and the remaining carbon atoms are optionally substituted by one or more radicals independently selected from the group consisting of (C 1 -C 20)alkyl, (C 5 -C 14)aryl, -OR 2, - R 3, -O R 4, - R 5, -NH-CO-R 6, -COOR 7, -NR 8 R 9, -NO 2, and halogen; R 2 to R 10 are the same or different, and are selected from the group consisting of: -H, (C 1 -C 20)alkyl, and phenyl; Ar is bonded to the -S- atom through an aromatic ring;and the molar ratio between the epoxide groups of the epoxide-functionalised resin and the epoxide-reactive functional radicals of the cross-linking agent of formula is comprised from stoichiometric to a two-fold excess of epoxide reactive functional group, and (b) curing the reaction mixture at a temperature comprised from 10 to 200 °C, this step being performed in the absence of a catalyst. (i) a reinforcement phase comprising fibres, this phase being in a volume percentage comprised from 25 to 70% with respect to the total volume of the composite, and (ii) a matrix phase which is in a volume percentage comprised from 30 to 75% with respect to the total volume of the composite, (a) mixing an epoxide-functionalised resin with a functionality equal to or higher than 2 with a cross-linking agent of formula Ar-S-S-Ar wherein Ar means a ring system from 5 to 14 carbon atoms, the system comprising 1-3 rings, where: the rings are saturated, partially unsaturated, or aromatic; provided that at least one ring is aromatic, the rings are isolated, partially or totally fused, at least one of the carbon atoms forming the aryl radical is substituted by an epoxide-reactive functional radical selected from the group consisting of: -NHR 10, -NH-NHR 10, -CO-NH-NHR 10, -COOH, -SH, -OH,-CO-NHR 10, -NCN-NH-NHR 10, wherein the asterisk denotes the carbon atom through which the epoxide-reactive radical binds to the ring system, and the remaining carbon atoms are optionally substituted by one or more radicals independently selected from the group consisting of (C 1 -C 20)alkyl, (C 5 -C 14)aryl, -OR 2, - R 3, -O R 4, - R 5, -NH-CO-R 6, -COOR 7, -NR 8 R 9, -NO 2, and halogen; R 2 to R 10 are the same or different, and are selected from the group consisting of: -H, (C 1 -C 20)alkyl, and phenyl; Ar is bonded to the -S- atom through an aromatic ring;and the molar ratio between the epoxide groups of the epoxide-functionalised resin and the epoxide-reactive functional radicals of the cross-linking agent of formula is comprised from stoichiometric to a two-fold excess of epoxide reactive functional group, and the rings are saturated, partially unsaturated, or aromatic; provided that at least one ring is aromatic, the rings are isolated, partially or totally fused, at least one of the carbon atoms forming the aryl radical is substituted by an epoxide-reactive functional radical selected from the group consisting of: -NHR 10, -NH-NHR 10, -CO-NH-NHR 10, -COOH, -SH, -OH,-CO-NHR 10, -NCN-NH-NHR 10, wherein the asterisk denotes the carbon atom through which the epoxide-reactive radical binds to the ring system, and the remaining carbon atoms are optionally substituted by one or more radicals independently selected from the group consisting of (C 1 -C 20)alkyl, (C 5 -C 14)aryl, -OR 2, - R 3, -O R 4, - R 5, -NH-CO-R 6, -COOR 7, -NR 8 R 9, -NO 2, and halogen; R 2 to R 10 are the same or different, and are selected from the group consisting of: -H, (C 1 -C 20)alkyl, and phenyl; (b) curing the reaction mixture at a temperature comprised from 10 to 200 °C, this step being performed in the absence of a catalyst.