The one with the "V" of hexagons on the side about 1/3 of the way from the back, and the hexagonal pattern on the sole. That's the one that comes in both Airmesh and hydrophobic upper (used to only be made with the airmesh upper); I think it's now labelled as "all terrain".
The proper trail version with the V-shaped lugs on the sole and the zigzag pattern on the side (plus the V near the front) just comes in the hydrophobic upper, as far as I know. I've been getting mine cheaply from SportShoes.com but I think they're nearly out of them now.