Nike Infinity Run 3 vs Brooks Glycerin 20: Two Comfy Daily Trainers Compared

Introduction

Big, cushioned, protective daily trainers are the shoes most runners actually spend their miles in, and two of the most established options in this space are the Nike Infinity Run 3 and the Brooks Glycerin 20. Both are premium, comfort-first trainers built for easy days and long miles, but they take noticeably different approaches to the same job.

This comparison looks at the key stats, design, fit, ride feel and durability of each, so you can work out which one belongs in your rotation.

Key Specs at a Glance

The numbers are closer than you might expect. The Nike Infinity Run 3 costs 144.95 pounds in the UK or 160 dollars in the US. The Brooks Glycerin 20 has an RRP of 155 pounds but is widely available for around 150 pounds; in the US there is no official listing yet, with estimates ranging from 160 to 190 dollars.

On the scale, the Brooks is the slightly heavier shoe at 314 grams (11 ounces) in UK size 9, versus 310 grams (10.9 ounces) for the Nike in the same size. The Nike has an 8 millimeter heel-to-toe drop while the Brooks sits at 10 millimeters, and both share a 34 millimeter stack height at the heel.

Design and Construction

The Infinity Run 3 uses a Flyknit upper, a stretchy knitted material paired with Nike’s Flywire system to create a strong midfoot hold. There is generous padding around the heel and tongue to keep the foot from shifting, plus extra stability features that make it more of a stable neutral shoe than a plain neutral one. A large plastic heel clip wraps around the outside of the back of the shoe, and the base is fairly wide.

The midsole is Nike’s React foam: solid, durable, and offering a little bounce, though it is more protective and comfortable than explosive. The outsole uses a slightly splotchy rubber coverage that looks a bit playful but is very durable, with good grip that lasts a long time.

The Glycerin 20 has an engineered mesh upper in the standard version, with a Stealth Fit edition offering a sleeker, slightly lighter upper. Plump padding around the heel and collar delivers the step-in comfort the Glycerin line is known for. The headline change is the DNA LOFT v3 midsole, a nitrogen-infused foam that is poppier, bouncier and lighter than the standard EVA used in past Glycerins, while keeping the comfortable feel of the line with a slightly more energetic character. The extensive outsole covering adds some weight but promises good grip and durability over many miles.

Fit and Sizing

Both shoes run true to size. Testers found the Infinity really comfortable, with an upper that has a slightly relaxed, giving feel if your foot presses against the sides. The Nike also offers a roomier toe box than the Brooks, along with excellent heel lockdown, something that was a small issue on the original Infinity but not on versions two and three.

The Glycerin is completely true to size and ranks among the most comfortable shoes many runners will ever wear. If you stick to your usual size, you should have no problems with either.

Ride Feel and Running Experience

The Glycerin 20 is a solid, comfortable easy-day shoe that can stretch to daily training miles, though it is not really a tempo shoe. The new midsole is an improvement over previous versions: at first step-in it does not feel quite as cushy as older models, and it feels slightly firmer, but the nitrogen-infused foam delivers consistent comfort and a bounce that seems to build over the course of a run. On progression runs, pace picks up nicely by the end of a session. One tester even raced close to a half marathon distance in it, finding it sluggish early on but increasingly willing to pick up the pace as the race went on.

For performance-focused runners with a rotation, the Glycerin makes a great easy shoe. For newer runners or those running mainly for health, it can cover just about everything thanks to its comfort and bounce. It has even been suggested as a comfortable marathon option for those not chasing a specific time, with enough resilience to go long.

The Infinity Run 3 is built for a similar purpose but with more stability features, positioning it as a protective, injury-proofing shoe. Its ride is much more of a rocker, smoother and duller in a good way: very protective and reliable rather than exciting. The ride feels a touch softer and more enjoyable than previous versions, making it a great catch-all trainer for unplanned easy runs, high-mileage marathon training weeks, and recovery days on tired legs. The rocker design feels smooth and sometimes even lets you tick along a bit quicker, but it is not a fast shoe. Neither is the Brooks exactly, though its foam is a bit more responsive and lively at pace, despite being the heavier of the two.

Durability and Outsole

The Infinity has always been insanely durable. The React foam is not the most exciting, but it feels the same day after day for years on end, potentially hundreds or even a thousand miles. The Glycerin’s new midsole foam is newer and feels a little more delicate to the touch, and with only around 50 km of testing there is no long-term verdict yet, though it is expected to be very durable too.

On outsoles, the Nike’s splotchy pattern might look like artwork, but it is a highly effective capsule: both shoes have excellent, durable outsoles with grip proven across many conditions.

Verdict and Buying Advice

If picking just one shoe for all your miles, the Glycerin 20 comes out ahead. It is the more versatile and more enjoyable shoe, with a more exciting ride and a more modern feel thanks to that new midsole. It excels at what it does: a very comfortable cushioned shoe with just enough versatility for faster efforts.

The Infinity Run 3 does not really excel in any single area, but it is a very solid shoe across a wide range of uses, which is why it appeals to beginner and recreational runners who wear one shoe for everything, races included. If you want extra stability, a protective rocker ride, and legendary durability, and you like the sleeker Nike styling for everyday wear, it will not let you down. If you have a rotation and want a genuinely lovely shoe for high mileage and long runs, the Brooks is the stronger pick.

Conclusion

Both of these are pricey, premium, comfortable protective daily trainers, and neither will disappoint. The Brooks Glycerin 20 earns the overall nod for its livelier foam and versatility, while the Nike Infinity Run 3 remains the dependable, stable, near-indestructible alternative for runners who value protection above all.