A pre-impregnated composite material for curing to form a cured composite part having high compression after impact and high wet compression strength at 82.2°C (180°F), said pre-impregnated composite material comprising: A) carbon reinforcing fibers; and B) a matrix comprising: a) a resin component made up of a difunctional epoxy resin in combination with at least one multifunctional aromatic epoxy resin with a functionality greater than two, wherein the difunctional epoxy resin is a diglycidyl ether of bisphenol F and is present in the range 20 wt% to 25 wt% of the matrix and the multifunctional aromatic epoxy resin with a functionality greater than two is triglycidyl para-aminophenol and is present in the range 20 wt% to 25 wt% of the matrix; b) from 5 wt% to 15 wt% by weight of the matrix of a thermoplastic particle component comprising at least 95 wt% based on the weight of the thermoplastic particle component, thermoplastic particles that comprise at least 95 wt% by weight of the particles of a polyamide which is the polymeric condensation product of 1,10-decane dicarboxylic acid and an amine component having the formula where both R 2 are hydrogen, and both R 1 are methyl; d) from 15 wt% to 30 wt% of the matrix of a polyether sulphone thermoplastic toughening agent; and e) from 15 wt% to 25 wt% of the matrix of a curing agent comprising 3,3'-diaminodiphenyl sulphone and/or 4,4'-diaminodiphenyl sulphone. A) carbon reinforcing fibers; and B) a matrix comprising: a) a resin component made up of a difunctional epoxy resin in combination with at least one multifunctional aromatic epoxy resin with a functionality greater than two, wherein the difunctional epoxy resin is a diglycidyl ether of bisphenol F and is present in the range 20 wt% to 25 wt% of the matrix and the multifunctional aromatic epoxy resin with a functionality greater than two is triglycidyl para-aminophenol and is present in the range 20 wt% to 25 wt% of the matrix; b) from 5 wt% to 15 wt% by weight of the matrix of a thermoplastic particle component comprising at least 95 wt% based on the weight of the thermoplastic particle component, thermoplastic particles that comprise at least 95 wt% by weight of the particles of a polyamide which is the polymeric condensation product of 1,10-decane dicarboxylic acid and an amine component having the formula where both R 2 are hydrogen, and both R 1 are methyl; d) from 15 wt% to 30 wt% of the matrix of a polyether sulphone thermoplastic toughening agent; and e) from 15 wt% to 25 wt% of the matrix of a curing agent comprising 3,3'-diaminodiphenyl sulphone and/or 4,4'-diaminodiphenyl sulphone. a) a resin component made up of a difunctional epoxy resin in combination with at least one multifunctional aromatic epoxy resin with a functionality greater than two, wherein the difunctional epoxy resin is a diglycidyl ether of bisphenol F and is present in the range 20 wt% to 25 wt% of the matrix and the multifunctional aromatic epoxy resin with a functionality greater than two is triglycidyl para-aminophenol and is present in the range 20 wt% to 25 wt% of the matrix; b) from 5 wt% to 15 wt% by weight of the matrix of a thermoplastic particle component comprising at least 95 wt% based on the weight of the thermoplastic particle component, thermoplastic particles that comprise at least 95 wt% by weight of the particles of a polyamide which is the polymeric condensation product of 1,10-decane dicarboxylic acid and an amine component having the formula where both R 2 are hydrogen, and both R 1 are methyl; d) from 15 wt% to 30 wt% of the matrix of a polyether sulphone thermoplastic toughening agent; and e) from 15 wt% to 25 wt% of the matrix of a curing agent comprising 3,3'-diaminodiphenyl sulphone and/or 4,4'-diaminodiphenyl sulphone.