With double-layer labels - more space on the product. They give a great opportunity for small size products to display more information on a label that's covering it. Both layers have adhesive on the back so it allows the upper paper or top film to be easily removed and stuck back multiple times maintaining the adhesion property. Depending on the amount of information - just 2 or all 3 sides can be printed. Commonly this kind of label is used for translations in multiple languages. Another great way of use is for promotions and competitions (for terms and conditions).