The Billabong Plunge Slimline 4.2m x 1.6m is the narrower take on the Billabong plunge idea, aimed at sites where width is the main constraint. As the smaller format in the line-up, it keeps the experience focused on cooling off, soaking and short easy dips rather than taking over the whole backyard. Because the design is so direct, it pairs naturally with paving, screening and compact planting without making the outdoor area feel crowded. The depth stays close to 1.6 metres throughout, giving the pool a straightforward feel in the water and a very predictable layout. The 1.6-metre width is especially useful on narrow suburban sites, giving you a genuine pool footprint without taking over the whole backyard. That makes it a useful FNQ option where the pool is there to cool the day down and finish the outdoor area rather than dominate it.