The Wellness Wedges are made in the USA from 100% recycled plastic. The Wellness Wedges are interlockable, so they can be stacked or placed side by side. The Wellness Wedge goes underneath your mattress, so you can sleep on your own pillow instead of an uncomfortable foam wedge. They offer approximately two and a half inches of elevation when placed side by side, or five inches when stacked depending on the firmness of your mattress. They release no chemical odors, hold no bacteria, and never need to be washed.