We purchased two large size
We purchased two large size goals. I didn't like the guy-wire/rope design foe the two poles, as the wires/ropes come into the field of play. We put two 1/2" x 10' rebar inside each pole and sunk the rebar into the ground (at a severe out-leaning) angle. That allowed us to discard the side ropes and stakes meant to hold the poles. Rebar is cheap.