A child is attending swimming lessons and at enrolment stage the parents were told they had to purchase a swimming hat. When asked why that was and they were told it was for health and safety reasons. The parents asked what they were and the attendant told them he was not really sure but thought it was to stop hair clogging the filters.
There is no health and safety regulation which requires people to wear hats in swimming pools. This is clear from the inconsistency that they are not required during public swimming sessions. Pool management may require pool users to wear hats during swimming lessons for other reasons - possibly to ease identification - but these should be made clear rather than simply offering "health and safety" as a possible excuse.