Cardboard beds have made a return to this year’s Summer Olympics in Paris.

The twin beds were introduced during the 2020 Tokyo Summer Olympics and have been reintroduced in France ahead of the games. The beds are a part of the Olympics’ effort to create the “greenest-ever Games” and reduce the carbon footprint of the event.

The bed frame is made of cardboard and has an adjustable mattress where athletes can alter their preferred hardness or softness of the mattress.The beds can also be adjusted to account for an athlete’s height.

When the beds were first unveiled in 2021, some speculated they were to prevent “intimacy among athletes,” but the Olympics have said they use cardboard for environmental reasons.

“These sustainable beds are 100% made in France and will be fully recycled in France after the Games,” a video posted to the Olympics’ official YouTube channel said.

The beds have mixed reviews. Australian water poloist Matilda Kearns posted on TikTok that she “already had a massage to undo the damage” of the bed, claiming it to be “rock solid” even on the softest setting.

“Knowing that Paris is going to have the cardboard beds again — the ‘anti-sex’ beds, which is not what they are for — they are very uncomfortable,” Nick Mayhugh, an American track and field athlete who won three gold medals and one silver in the Tokyo Paralympics, told CBS Sports. 

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“So I think I’m going to Amazon to order a mattress topper and have it shipped there so I can be more comfortable than I was in Tokyo. But maybe I should sleep uncomfortably. Maybe that’s why I won four medals,” he continued.

France is also not offering air conditioning in the Olympic Village, but some countries, like the US, are offering their athletes portable air conditioners.