SMART DESIGN - The ridges are high on two sides and low in the middle, allowing water to drain from both sides and drain into a sink quietly and easily. Simple yet functional, you don't have to do anything. Please note that the drain side is on the short edge RELIABLE MATERIAL - BPA-free, food-grade silicone. The ridges are designed to provide a safe and stable surface for your drying needs. If there is little crease in the item (when packed) results in water pooling in the center of the mat, please contact us to solve your problem! VARIETY OF USES - Can be used as a dish drying mat, heat insulation/trivet mat, and refrigerator or freezer storage. Wide temperature range (-40F~ 446F/-40C to 230C) and ruggedness allow you to use it virtually anywhere ...