What They Have in Common
Both are Fiberbuilt mats on rubber foundations with Performance Turf, both let you push a real tee straight into the turf, and both carry the same warranty structure: 1 year on the turf, 5 years on the rubber base. That warranty split is worth knowing — the turf gets one year, the base gets five, on both.
Where They Differ
The hitting surface
This is the real fork. The Grass Series Traditional 5×4 is a two-component mat: a 4×4 Performance Turf stance area plus a separate 1×4 Fiberbuilt Grass hitting panel offset to one side. That Grass panel is the mat's whole argument — it's what carries the 300,000-shot guarantee and what you're paying $700 more for. The Tee Box 4×4 is uniform Performance Turf across the full 49×49 inches. No separate panel, no dedicated hitting zone. You hit from wherever you stand.
Which matters: Fiberbuilt doesn't publish whether that Grass panel can be replaced on its own. The Tee Box has no replaceable strip — the entire surface is one piece, so when it wears, it wears. Fiberbuilt doesn't publish a parts list for the Tee Box, so there's no documented path to replacing just the worn section.
Size and construction
The Grass Series measures 60×48 inches. The Tee Box 4×4 is 49×49 inches — square. The Grass Series has a one-piece solid rubber foundation; the Tee Box uses a modular rubber base assembled tool-free. Fiberbuilt publishes the Tee Box's weight at 72 lbs. They don't publish a weight for the Grass Series.
Fiberbuilt also publishes the Tee Box's thickness at 2 inches. They don't publish a thickness for the Grass Series. That 2 inches is the finished height of the Tee Box off the floor — a figure you can measure your own setup against. The Grass Series leaves you without a number to check.
Tee setup and a labeling oddity
Both mats allow a real tee anywhere in the turf. The Grass Series also ships with a rubber tee and a friction-fit tee holder for the 4-hole Grass panel, and Fiberbuilt's Adjustable Tees are designed for that panel — though those are listed as temporarily discontinued. One thing to flag: the Grass Series product page lists the included rubber tee as 2.265 inches, where every other Grass panel listing from Fiberbuilt says 2.625 inches. I don't know which is right, and I don't work at Fiberbuilt.
Price
The Tee Box 4×4 lists at $499. The Grass Series Traditional 5×4 lists at $1,199 — a $700 gap at list.
Who Should Buy Which
Fiberbuilt Grass Series Traditional 5×4 if:
- You specifically want the Fiberbuilt Grass hitting panel and its 300,000-shot guarantee
- You prefer a one-piece solid rubber foundation over modular assembly
- The offset hitting-zone layout suits how you've positioned things in your bay
- You're okay with Fiberbuilt not publishing thickness or weight, or you've confirmed the specs by other means
Fiberbuilt Performance Turf Tee Box 4×4 if:
- You want to hit from anywhere on the surface without a fixed hitting zone
- $499 is more in line with what you want to spend
- You want to know the mat is 2 inches thick and 72 lbs before it arrives
- You're considering the 5×5 or 6×6 versions down the line — the same line scales up, same surface
- Your setup doesn't need a dedicated Grass panel
The Bottom Line
The Tee Box 4×4 is the practical buy for most people. It's $700 less, it publishes its weight and thickness, and uniform Performance Turf handles the job most golfers are setting up a home bay for. The Grass Series Traditional 5×4 makes sense if you want that dedicated Grass panel — that's a real distinction, not just a marketing tier — but the premium is steep, and Fiberbuilt leaves you guessing on thickness and weight at that price point.
Get the Fiberbuilt Performance Turf Tee Box 4×4.