Coffee cup sleeves, also known as coffee sleeves, are roughly cylindrical sleeves that fit tightly over handle-less paper coffee cups to insulate the drinker’s hands from hot coffee. The coffee cup sleeve was invented by Jay Sorensen in 1991. The paper-based Mizuno Sangyo Cup Sleeve features 3 distinct notches for three-stage adjustments. The three notches serve as locking tabs or slots and allow you to adjust the length of the sleeve to fit three cup sizes (such as Small, Medium, and Large, or 8 oz, 12 oz, and 14 oz cups).
Coffee cup sleeve: https://en.wikipedia.org/wiki/Coffee_cup_sleeve
A Mizuno Sangyo Cup Sleeve and Guatemalan coffee beens
Mizuno Sangyo Co. Ltd. : https://www.mizunoes.com/c/30/3004/3004001/188048B; Guatemalan coffee beens: https://www.guatemalancoffees.com/
Cairn Coffee: (In Japanese) https://www.cairn.co.jp/index_2309.html
Republic of Guatemala: https://en.wikipedia.org/wiki/Guatemala