Look closely at the last pic (6th) of the coloured one for some lols.
TBH haven't tried this specific Keep cup before but didn't know they made tempered glass double walled ones (and in XL), i thought it was only plastic.
Edit: the outer wall is plastic, just read. Inner is glass.
Decent price at the moment for a tall (was $37, $33 elsewhere). All their KeepCup stock is 30% off atm.
Note coloured ones are selected at random.