plastic shrinks under heat.... yes... this is known... its why we SHRNK WRAP things with HEAT
Thats car wrapping vinyl... Its called memory effect..
"What's your demands Mr scientist?" I need a large warehouse and an assistant who has killer legs
Now do that 100 times
It's the exact opposite with boys
Cold deformation puts strain onto the plastic film. Heat causes relaxation of polymer chains allowing the object to return to most favourable energy state
We alaskans been using this shit for window insulation for decades