Certified Engineered Wood Fiber Playground Chips are a superior quality wood-fiber material. It is made from 100% virgin wood fiber, not recycle used wood, which may contain things you don't want in your playground. Our material carries a certificate of Purity. It's fall-protection effectiveness is grounded in the physics of wood chips. When it is laid, the finer wood chips sink to the bottom creating a soft bedding for the larger pieces on top. This natural “layering” provides buoyancy that cushions the impact of a fall, and insures quick drying.