The attention for sufficient fluid intake, swallowing difficulties and independence is increasing.
There is a large selection of functional and contemporary cups that meet these needs.
Hard plastic cups have the advantage that they often look extra transparent and therefore more beautiful.
Keep in mind, however, that every hard plastic cup gets frequent damage (micro-cracks or discolouration) with frequent use in an industrial dishwasher and therefore does not last forever; also ensure that these cups are not stacked together during the cooling phase before they have cooled completely.
The mention dishwasher safe that the manufacturer uses is therefore relatively and often limited to household use.