That tube thing that tennis players suck on

[TrickyD]

Apologies if this has been asked on one of the other ‘Emma’ threads, but please can someone explain what that concertina tube is that the the players (well Emma anyway) suck/breathe through while sitting between sets?
I have never seen this before. Is it a player’s personal equipment or is it provided by the venue managers?

It's aircon, or so the commentator said yesterday.

It's an air conditioning tube to cool her down. Presumably provided by the organisers.

The only tube I saw was the black one , it was air conditioning.

I didn’t see her sucking or breathing through anything?

Thanks. I guess when I thought she was sucking on it she just had it trained on her face. I didn’t hear the commentator’s explanation. I only watched the match intermittently, not a tennis fan, but well done Emma.