Wow what a disappointment.
These glasses DO NOT hold 250ml and are to small to hold a latte made from a Nescafe Gusto machine. The most fluid I managed to get into the glass was 200ml and that was full to the brim, the only thing I can think that 250ml referred to in this items description is how much water displacement occurs when you put it in the washing up bowl.
I see there is another pair of latte glasses advertised that are taller and claim to hold less liquid than these. so someone has got their measurements wrong.2 X Latte Coffee Glasses Mugs - (1 Pair) - Height 110mm