What do you wear to go to the Antarctic?
A team of scientists from the UK and US have travelled to Thwaites glacier in Antarctica to carry out research.
BBC Environment Correspondent Justin Rowlatt went along with them to learn more about what their work.
But it's not like packing for a holiday in Spain, or even somewhere really cold like Russia.
It could be even colder than minus 30 degrees. So what was in his Antarctic wardrobe?