Collation shrink film protective structure

A heat shrinkable multilayer film comprising

• at least one ionomer layer consisting essentially of a copolymer of ethylene and methacrylic acid or acrylic acid wherein from about 1 to about 99% of the carboxylic acid groups are neutralized to carboxylate salts comprising metal ions, and wherein the at least one ionomer layer comprises from 5 to 40 weight % of the multilayer film;
• and
• at least one additional layer comprising a polyolefin, wherein the at least one additional layer comprises 60 to 95 weight % of the multilayer film;
• wherein the film exhibits shrinkage of at least about 5% when exposed to a temperature of about 80 to about 100° C. for about 3 to about 7 minutes;
• shrinkage of not more than 10% when exposed to a temperature of 80° C. for 10 seconds;
• and shrinkage of not more than 20% when exposed to a temperature of 90° C. for 10 seconds.