CAP Barbell 24" x 24" Interlocking Puzzle Mat (6 Piece) Single: 6 interlocking EVA foam squares. 24 SQFT Pack of 4: 24 interlocking EVA foam squares. 96 SQFT Pack of 6: 36 interlocking EVA foam squares. 144 SQFT 1/2-inch thick EVA foam provides floor protection