Over the rainbow we go! SoftZone® Rainbow set encourages kids to safely climb, crawl and balance in a soft, stable environment. The 7 foam bolsters hook to the rainbow arches with loop lock attachments to prevent pieces from sliding apart during use. Rainbow arches are thicker at the base for added stability. Soft, sturdy, polyurethane foam is covered in reinforced, phthalate-free vinyl to create a comfy and stimulating learning environment. Encourages social interaction, color recognition, and gross motor skills.