I have always enjoyed sports, especially swimming; we have an open-airpool at home, which we swim in when it's not too cold.
Times, Sunday Times (2010)
As well as an open-air rooftop pool with stunning views of the city, there's a series of steam rooms and another pool downstairs in which to gently drift.
Times, Sunday Times (2010)
There's also a terrace with an open-airpool.
Times, Sunday Times (2012)
Seeindoor pool
Definition of 'open-air'
open-air
Explore 'open-air' in the dictionary
adjective [usually ADJECTIVE noun]
An open-air place or event is outside rather than in a building.