ROBBE: The good news about the rise of the super shoe over the last half decade is that sooner or later, all that bouncy foam had to trickle down to everyday folks running everyday miles. Sometimes, it came in spurts (e.g., the first version of this shoe with a small puck of Lightstrike Pro); sometimes, it came in spades (e.g., Asics Superblast). The point is, we’ve been seeing more and more of it, which is a great thing.
Lightstrike Pro, the bouncy foam found in top-tier, record-breaking shoes like the Adizero Prime X Strung and Adizero Adios Pro 3, has always been a solid foam that shows up on race day. It deserves the praise it gets. Basic Lightstrike, on the other hand, has been a letdown since the beginning, providing a mostly dead and dense feeling underfoot. The chasm between the two foams with similar names was deep and wide.
But now we have Lightstrike 2.0, which has softened up around the edges. In the SL 2, it’s used as a carrier around a generous bed of Lightstrike Pro. Two roads converged in a shoe, and that has made all the difference.
What we like about the Adidas Adizero SL 2
THOMAS: The SL 2 looks sleek with a micromesh upper that wraps the foot and fits like it’s ready for race day. “Race day” is code for a snug-fitting upper, and with my narrow foot, I welcome it. A well-padded tongue and collar provide comfort and a solid lockdown.
The fit is true to size, and my US M10.5 weighs 9.1 oz. (257 g.) That’s over an ounce lighter than the Nike Pegasus 41, and the lighter weight is noticeable when you turn up the heat and push faster paces. With a stack height of 36/27 (9 mm drop), it sits similar to the Pegasus 41; however, where we complained about the Peg feeling thin under the forefoot, the SL 2 has plenty of protection under the fat pad. I’ll chalk it up to how the Lightstrike combo softens the blow of impact.
Also, where the previous version of the SL had a puck of Lightstrike Pro, the SL 2 has a full-length slab of Lightstrike Pro sandwiched in a softer, spongier bed of Lightstrike 2.0. Footfalls in the SL 2 are softer but not deadening, and the foams rebound nicely. While the outsole rubber isn’t Continental, traction and tackiness are more than adequate.
ROBBE: There’s something about the look of this shoe that I just love. Maybe it’s the Samba-esque vibes; maybe it’s just the bold three stripes on black and the pink highlights. Either way, if you’re seeing what I’m seeing, then you already know it’s clean.
The upper is snug and secure at all points. Heel pillows keep everything locked in around the ankle, while the heavily padded tongue and easy lacing system (seemingly a first in Adizero shoes) provide a form-fitting wrap. This is a narrow shoe, so beware those of you with wider widths or high-volume feet. Personally, I loved it.
Underfoot is where Adidas has finally unlocked the secret of its own foam, solving the mystery of how Lightstrike and Lightstrike Pro can actually work together. I won’t sugarcoat it: for its first few years, I thought Lightstrike was a pretty garbage midsole and a poor successor to the Boost throne. I’m not alone here; very few runners found it to be anything other than dense and dead, a phrase which will probably find its way onto my headstone when I’m gone.
Lightstrike 2.0 had definitely softened up a bit and it’s generally worked well in shoes like last year’s SL. In this shoe, however, it’s finally found its lane, that of a supporting actor ceding the limelight to the main star, Lightstrike Pro. Used as a carrier around a bed of Lightstrike Pro, the entire package comes together in what has to be one of the best Adidas midsole combos in recent memory, especially at this price point ($130).
The ride is smooth and snappy at the same time, steady for daily training but fast when it’s required. In a way, it ties together the feel of all the best of Adidas’ midsole technologies. You get the bounce and energy return of the Lightrike Pro, but it’s stabilized and reined in by the Lightstrike 2.0. It’s a performance feel, but just in a more muted form, which is kind of exactly what you want in a lightweight trainer that can still handle big mileage.
I took this shoe out for a few runs, including a 12-mile long run with mixed elevation on crushed gravel. I absolutely loved it from beginning to end and even dropped my pace for the last three miles to a tempo pace, much below half marathon. I had no issues with weight or picking it up; it moved seamlessly between pace ranges.
The outsole doesn’t use Continental rubber like the more premium Adizero models, but it doesn’t seem to matter much — it’s still very good and covers much of the underfoot area.
Final thoughts on the Adidas Adizero SL 2
THOMAS: The Adizero SL 2 is one of my favorite daily trainers this year. I would put it in the same league with the New Balance FuelCell Rebel v4 and the Hoka Mach 6. All of these fit into my quiver of light, stripped-down daily trainers that can go with you when you want to go fast. I would still mix it with an actual race-day shoe and an excellent, well-cushioned recovery-day trainer.
For example, if I were building an Adidas-only lineup, it would look like this: the SL 2 for days when I feel fresh and may push the tempo, the Adios Pro for workouts and racing, the Ultraboost or Prime X Strung 2 for recovery runs. At $130 at launch, the SL 2 won’t bust your piggy bank. If you are on a tight budget, grab the original SL on sale for under $50; it’s still that good.
