Great for families that are looking for a semi-permanent backyard pool, Bestway� Hydrium� pools provide a durable steel wall that can stay up all year long, even during the off-season. Hydrium pools are built with corrosion-resistant steel material, which prevents rust and oxidation. These pools are designed to be dependable and an investment in family fun for years to come. The round shape models provide a classic shape for family pooltime fun. Easy to set up, these pools will provide many summer memories!