A multi-layer tube comprising: A) a first layer comprising a first layer composition comprising a1) 25 to 100 weight percent of a semi-aromatic polyamide whose repeat units consist essentially of 60 to 85 molar percent of repeat units of the formula -C (CH 2) m C NH(CH 2) 6 NH- wherein m is 8 or 10, and 15 to 40 molar percent of repeat units of the formula a2) 10 to 40 weight percent of polymeric toughener; a3) 0 to 15 weight percent plasticizer; a4) up to 40 weight percent aliphatic homopolyamide having a repeat unit derived from an aliphatic diamine and aliphatic dicarboxylic acid, amino acid or lactam, wherein said aliphatic diamine, amino acid or lactam, have 6 or less carbon atoms, wherein a4) is present; a5) 0 to 5 weight percent of additives selected from the group consisting of colorants, antioxidants, heat stabilizers, light stabilizers, lubricants, and nucleants; and B) a second layer comprising a second layer composition comprising b1) 50 to 100 weight percent of poly(caprolactam); b2) 0 to 40 weight percent of polymeric toughener; b3) 0 to 15 weight percent plasticizer; b4) 0 to 5 weight percent of additives selected from the group consisting of colorants, antioxidants, heat stabilizers, light stabilizers, lubricants, and nucleants; wherein the ratio of a1:a4 in the first layer composition is 80:20 to 40:60; and with the proviso that the first layer and second layer are in direct contact; and the weight percents are based upon the total weight of the first layer composition and the second layer composition, respectively. A) a first layer comprising a first layer composition comprising a1) 25 to 100 weight percent of a semi-aromatic polyamide whose repeat units consist essentially of 60 to 85 molar percent of repeat units of the formula -C (CH 2) m C NH(CH 2) 6 NH- wherein m is 8 or 10, and 15 to 40 molar percent of repeat units of the formula a2) 10 to 40 weight percent of polymeric toughener; a3) 0 to 15 weight percent plasticizer; a4) up to 40 weight percent aliphatic homopolyamide having a repeat unit derived from an aliphatic diamine and aliphatic dicarboxylic acid, amino acid or lactam, wherein said aliphatic diamine, amino acid or lactam, have 6 or less carbon atoms, wherein a4) is present; a5) 0 to 5 weight percent of additives selected from the group consisting of colorants, antioxidants, heat stabilizers, light stabilizers, lubricants, and nucleants; and a1) 25 to 100 weight percent of a semi-aromatic polyamide whose repeat units consist essentially of 60 to 85 molar percent of repeat units of the formula -C (CH 2) m C NH(CH 2) 6 NH- wherein m is 8 or 10, and 15 to 40 molar percent of repeat units of the formula a2) 10 to 40 weight percent of polymeric toughener; a3) 0 to 15 weight percent plasticizer; a4) up to 40 weight percent aliphatic homopolyamide having a repeat unit derived from an aliphatic diamine and aliphatic dicarboxylic acid, amino acid or lactam, wherein said aliphatic diamine, amino acid or lactam, have 6 or less carbon atoms, wherein a4) is present; a5) 0 to 5 weight percent of additives selected from the group consisting of colorants, antioxidants, heat stabilizers, light stabilizers, lubricants, and nucleants; and B) a second layer comprising a second layer composition comprising b1) 50 to 100 weight percent of poly(caprolactam); b2) 0 to 40 weight percent of polymeric toughener; b3) 0 to 15 weight percent plasticizer; b4) 0 to 5 weight percent of additives selected from the group consisting of colorants, antioxidants, heat stabilizers, light stabilizers, lubricants, and nucleants; wherein the ratio of a1:a4 in the first layer composition is 80:20 to 40:60; and with the proviso that the first layer and second layer are in direct contact; and the weight percents are based upon the total weight of the first layer composition and the second layer composition, respectively. b1) 50 to 100 weight percent of poly(caprolactam); b2) 0 to 40 weight percent of polymeric toughener; b3) 0 to 15 weight percent plasticizer; b4) 0 to 5 weight percent of additives selected from the group consisting of colorants, antioxidants, heat stabilizers, light stabilizers, lubricants, and nucleants; wherein the ratio of a1:a4 in the first layer composition is 80:20 to 40:60; and with the proviso that the first layer and second layer are in direct contact; and the weight percents are based upon the total weight of the first layer composition and the second layer composition, respectively.