A curable benzoxazine resin composition comprised of at least a component, a component, and a component, wherein: a) the component is comprised of at least one benzoxazine of Formula: wherein Z is selected from C=O, CH 2 OC(=O), O, S, S=O, or O=S=O, each R is independently selected from hydrogen, a C 1 -C 20 alkyl group, an allyl group, or a C 6 -C 14 aryl group, and each R 1 is independently selected from hydrogen, a C 1 -C 20 alkyl group, an allyl group, or a C 6 -C 14 aryl group; b) the component is comprised of at least one benzoxazine of Formula (IA') and/or Formula (IB'): wherein n is 0 or 1; if n=1, Z' is selected from a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted divalent C 6 -C 20 aryl group, or a substituted or unsubstituted divalent C 2 -C 20 heteroaryl group; and if n=0, the benzyl groups of the benzoxazine moieties are fused or connected by a direct bond between the two benzoxazine moieties; L is selected from a divalent hydrocarbon linkage group such as CH 2, C(CH 3) 2, CH(CH 3), dicyclopentadiene, Ar, and Ar-Y-Ar, where Y may be a direct bond C(R 2)(R 3), C(R 2)(Ar), a divalent heterocycle, [C(R 2)(R 3)] x -Ar-[C(R 4)(R 5)] y S, SO 2, and O, where Ar is an aryl group. R 2, R 3, R 4, and R 5 are independently selected from H, C 1 -C 8 alkyl and halogenated alkyl; c) the component is comprised of at least one cycloaliphatic epoxy resin represented by Formula: wherein m= 0 or 1; R 6 and R 7 are the same or different and are each a substituted or an unsubstituted C 1 -C 20 aliphatic moiety which together with carbon atoms of an epoxy group form at least one aliphatic ring, wherein m is 0 or 1; when m=1, X represents a single bond, two single bonds or, a divalent moiety; wherein when m=0, the aliphatic rings are fused which include R 6 and R 7 (that is, a fused ring system is present which involves R 6 and R 7); d) The curable benzoxazine resin composition, wherein component and component are present in a mass ratio / of between 1/2 and 5/1 inclusive and component, component and component are present in a mass ratio /( +) of between 1/9 and 2/3 inclusive. a) the component is comprised of at least one benzoxazine of Formula: wherein Z is selected from C=O, CH 2 OC(=O), O, S, S=O, or O=S=O, each R is independently selected from hydrogen, a C 1 -C 20 alkyl group, an allyl group, or a C 6 -C 14 aryl group, and each R 1 is independently selected from hydrogen, a C 1 -C 20 alkyl group, an allyl group, or a C 6 -C 14 aryl group; b) the component is comprised of at least one benzoxazine of Formula (IA') and/or Formula (IB'): wherein n is 0 or 1; if n=1, Z' is selected from a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted divalent C 6 -C 20 aryl group, or a substituted or unsubstituted divalent C 2 -C 20 heteroaryl group; and if n=0, the benzyl groups of the benzoxazine moieties are fused or connected by a direct bond between the two benzoxazine moieties; L is selected from a divalent hydrocarbon linkage group such as CH 2, C(CH 3) 2, CH(CH 3), dicyclopentadiene, Ar, and Ar-Y-Ar, where Y may be a direct bond C(R 2)(R 3), C(R 2)(Ar), a divalent heterocycle, [C(R 2)(R 3)] x -Ar-[C(R 4)(R 5)] y S, SO 2, and O, where Ar is an aryl group. R 2, R 3, R 4, and R 5 are independently selected from H, C 1 -C 8 alkyl and halogenated alkyl; c) the component is comprised of at least one cycloaliphatic epoxy resin represented by Formula: wherein m= 0 or 1; R 6 and R 7 are the same or different and are each a substituted or an unsubstituted C 1 -C 20 aliphatic moiety which together with carbon atoms of an epoxy group form at least one aliphatic ring, wherein m is 0 or 1; when m=1, X represents a single bond, two single bonds or, a divalent moiety; wherein when m=0, the aliphatic rings are fused which include R 6 and R 7 (that is, a fused ring system is present which involves R 6 and R 7); d) The curable benzoxazine resin composition, wherein component and component are present in a mass ratio / of between 1/2 and 5/1 inclusive and component, component and component are present in a mass ratio /( +) of between 1/9 and 2/3 inclusive.