The Bestway Power Steel Swim Vista Series II 56976E 18'x48" Pool Set is the second generation of the first ever pool with built-in windows! With reinforced, fortified windows built into the sides of the pool, swimmers can wave and make silly faces as they paddle by. These windows also allow parents to easily keep an eye on the kids as they dip and dive underwater. Plus, minimal-tool setup makes this pool a no-brainer.