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They are if you take the cork off.
You could replace with silicone which is happier in the dishwasher
https://uk.keepcup.com/band-glass
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Think they recommend against taking the cork off as it'll end up breaking apart taking it off and putting it on. I had a glass one with a silicone sleeve which was fine. Though I'd recommend against KeepCups for filter (or americanos for that matter). Over time the seal goes and ends up leaking coffee as you drink. Their proposed solution to this was to wait until the coffee had cooled a bit before putting the lid on. Pretty disappointing in that regard. I bought a new lid and it had the same issues within a few weeks.
What are people using to actually drink their coffee?
I'm using one of these:
but they're not machine washable, and it was my office coffee cup, so feels a bit wrong at home.
What are my alternatives? I quite like the no-handle thing.