MagniMoist doesn’t let water escape from your basket until your plant is completely hydrated. When you water, MagniMoist’s smart natural fibers deflects water back into the dry soil above it. Then when the soil is fully saturated, the fiber becomes porous and releases only the excess water. Proven to outperform old fashioned coco liners. Custom shape fits standard 18” trough, hayrack or window box planter) Use two liners together for a 48″ trough.