Additive mixture containing a particular sterically hindered amine compound and a heat reflecting interference pigment

A three-layer film comprising:

• (I) a low density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-butyl acrylate copolymer, or mixtures thereof;
• (II) an additive mixture comprising components (A) and (B),
• wherein:
• component (A) is a compound of the formula (I-1-a), or a mixture of the compounds of the formulae (I-1-a) and (II-1-a):
• wherein n following the bracket of formula (I-1-a) is a number from 1 to 10, and
• wherein two outer layers of the three-layer film comprise the (I) and component (A), and a middle layer of the three-layer film further comprises the (I) and (II), wherein the component (B) is at least one heat reflecting interference pigment, which is in the form of platelets coated with one or more metal oxides, wherein the platelets comprise layered silicate, glass, or ceramic.