As a countermeasure against air conditioning
I bought size L for 161 cm.
The sleeve length is just right.
It doesn't feel tight even if I wear a thin long sleeve underneath.
When I tried it on in the store, M had short sleeves, and XL had sleeves that went down to my fingers.
It seems useful not only for air conditioning but also as a cover-up for chilly skin. I liked the bright color that can be used in spring and summer.