A mat perimeter system comprising a mat module, a connector, a resilient border and a resilient corner is disclosed. The mat module has upstanding studs attached on one edge and matching stud receptacles formed into another edge. The studs fit within the stud receptacles allowing the building of a modular mat system. Connectors having two spaced apart rows of studs attached to a base fit within the stud receptacles and allow the creation of another row of studs. Borders and corners fit over the studs to create a desirable perimeter. The studs have locking lips for interlocking with lip recesses formed within the stud receptacles and for interlocking with stud slot lip recesses formed into the borders and corners.