A spacer profile for use in a spacer frame of an insulating pane unit for door or window or facade elements, the insulating pane unit comprising panes having an intervening space defined therebetween, the spacer profile comprising a hollow profile body made of a synthetic material comprising a chamber for accommodating hygroscopic material, the hollow profile body - extending in a longitudinal direction (Z), and - comprising an inner wall , which faces the intervening space between the panes of the insulating pane unit in the assembled state of the insulating pane unit and delimits the chamber, an outer wall on the side of the chamber that is opposite to the inner wall in a height direction (Y), which is perpendicular to the longitudinal direction Z, and, laterally in a transverse direction (X), which is perpendicular to the longitudinal direction (Z) and to the height direction (Y), a first side wall and an opposing second side wall , which are connected with the inner wall and the outer wall to form the chamber , a first reinforcement layer made of a first metal material having a first specific heat conductivity (λ 1 ), the first reinforcement layer extending in one piece on and/or in the first side wall with a constant cross section perpendicular to and in the longitudinal direction (Z), and having a first thickness (d1), a second reinforcement layer made of a second metal material having a second specific heat conductivity (λ 2 ), the second reinforcement layer extending in one piece on and/or in the second side wall with a constant cross-section perpendicular to and in the longitudinal direction (Z) spaced by a first distance (a1) from the first reinforcement layer , and having a second thickness (d2), and a diffusion barrier layer made of at least one first layer made of a diffusion-proof synthetic material having a third thickness (d33) and a third specific heat conductivity (λ 33 ), the diffusion barrier layer being formed on the outer wall at least between the first reinforcement layer and the second reinforcement layer and being connected in a diffusion-proof manner with the same to form a diffusion barrier , wherein the product of the third specific heat conductivity (λ 33 ) and the third thickness (d33) is smaller than the product of the first specific heat conductivity (λ 1 ) and the first thickness (d1) and smaller than the product of the second specific heat conductivity (λ 2 ) and the second thickness (d2), and the diffusion barrier layer is formed in an overlapping manner with the first and the second reinforcement layer . - extending in a longitudinal direction (Z), and - comprising an inner wall , which faces the intervening space between the panes of the insulating pane unit in the assembled state of the insulating pane unit and delimits the chamber, an outer wall on the side of the chamber that is opposite to the inner wall in a height direction (Y), which is perpendicular to the longitudinal direction Z, and, laterally in a transverse direction (X), which is perpendicular to the longitudinal direction (Z) and to the height direction (Y), a first side wall and an opposing second side wall , which are connected with the inner wall and the outer wall to form the chamber , <EOS>