Four breathable mesh walls create a 79 x 55 x 27 in play area where children from 10 months to 6 years can sit, crawl, walk, or play with the 50 included ocean spheres. The mesh sides let parents monitor activity while toddlers see their surroundings. A 27-in high panel and four pull rings help babies practice pulling up and learning to stand. A safety door with external zippers prevents opening from the inside, while a metal frame with non-slip foot mats and suction cups helps keep the playpen stable.