 Well, the firmer side is great for younger kids when they need more spinal support to aid proper development of their growing bodies. You simply flip it over when they're a little older, around 8 to 12 years old, when they want the softer side for sleep. Handcrafted and assembled right here in the USA, Helix is offering up to 30% off all mattress orders, including the kids' mattress. Go to helixsleep.com slash Bubba. Their best offer yet. It won't last long. Go to rickandbubba.com and look under Sponsors.