Icee Mix It UP Sour Belts. Enjoy a delightful combination of tartness and sweetness in every bite. Whether you're indulging in a movie night at home, stocking up for a party, or simply treating yourself to a tasty snack, the ICEE Mix It Up Sour Belts 125 pieces per box.Icee Mix It UP Sour Belts. Enjoy a delightful combination of tartness and sweetness in every bite. Whether you're indulging in a movie night at home, stocking up for a party, or simply treating yourself to a tasty snack, the ICEE Mix It Up Sour Belts 125 pieces per box.