Shop the Arena The One swim mask collection online with Swimmer for fast shipping Australia wide! The One mask by Arena is part of the Arena fitness swimming goggles range. Called 'The One' as this Arena mask has been designed to fit most faces, Arena The One goggles offer a mask design that is an excellent alternative to classic swimming goggles. Arena The One mask goggles are available in a variety of colours - you can shop the Arena The One range online 24/7 with Swimmer!