The Transitions® Modular Entry Mat is a portable rubber threshold mat which is made of 100% recycled rubber and can easily be trimmed or notched to fit various entryway heights as it sits directly against the door sill to provide a smooth transition over most thresholds.It can be transported from one location to the next, and creates a smooth transition. Ideal for indoors and outdoors. The Modular Entry Mat can be used for exits and entries, both indoors and outdoors to meet a variety of needs. The Transitions Modular Entry Mat can be combined with optional risers to obtain a maximum height of 4.75 inches