This top is made up of a singlet, a tube collar and a bolero cardigan that can be worn together or as separates. This means you can wear it all year long- when it’s cool or warm outside and in the unpredictable air conditioning.
The layering makes it easy to swap out pieces for different styles (perhaps a hood instead of a collar?), or wear each piece with mixed other garments you own.
To make each layer last as long as possible, the parts that are most likely to wear out in time have been designed to be easily replaced.
How to replace the cuffs on the bolero cardi is explained here.