Saucony Endorphin Racer 2 Review

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The original Endorphin is an outstanding running shoe, providing a surprising level of cushioning at an ultralight weight. I had incredibly high hopes for this second generation, with reports of improved cushioning and only slight weight gain. The forefoot was also changed to use TPU foam, which can be far more resilient and long-lasting, as well as provide rather more bounce than traditional EVA foam which is still used in the rear of the shoe. Sadly, while the reports of the weight gain were true, the cushioning is actually quite a lot worse than of the original shoe. My initial runs in the endorphin 2 were a little slower than I'd have expected, and the shoe didn't feel cushioned enough to give me improved Running Economy you can get with modest cushioning. My initial impressions of this being more of a minimalist rather than optimal running shoe were confirmed by some later calculations of the shoes measured cushioning. I've rated the endorphin to as "worth considering", as I think there are far better light weight running shoes on the market, including its predecessor. You can read my review of the original at Saucony Endorphin 1. (I use The Science of Running Shoes as the basis of how I test running shoes and what you should look for in a running shoe.)

Saucony Endorphin top
Saucony Endorphin bottom
Saucony Endorphin inside
Saucony Endorphin outside
helping-hand.jpg

1 Shape and Fit

I don't normally comment on the fit of running shoes, as everybody's foot is a slightly different shape. However, I found that the Endorphin 2 has a rather unusual shape. I've found the key to getting a shoe that fits well is to ensure that the curve on each side of the forefoot matches the curves of the shoe. If you look at the photo below, the point marked by the blue arrows and red arrows should line up, so that the bulge to the inside of the ball of the foot matches the on the shoe, and likewise on the outside. With the Endorphin 2, I found that when I had a ideal fit from the ball of my foot back, the toe box was radically too small. While a misshapen toe box is endemic to running shoes, and I typically can't the toe box open, the Endorphin 2 is far worse, being too narrow and too short.

Getting the right fit is generally a matter of ensuring the widest part of the forefoot lines up with the widest part of your foot. Everything else flows from that.

2 Characteristics

  • Cushioning . The Endorphin 2 uses Saucony's EVERUN under the forefoot, which is their form of TPU foam. TPU foam tends to be much longer lasting than traditional EVA foam, and it can be rather more spring the, but unfortunately quite a bit heavier as well. I've generally found Saucony's implementation of TPU to be inferior to other companies, especially when comparing to the awesome Altra Escalante. I found the endorphin 2 to be rather under cushioned, and therefore slower than a slightly better cushioned shoe, so I'm classifying it as a minimalist shoe, though it's probably got a little too much midsole for most runners looking for a minimalist shoe. The traditional EVA foam used in the rear of the midsole is rather firm a than is typical, probably to match the cushioning characteristics of the TPU foam in the forefoot more closely. It's hard to see the dividing line between the two types of foam, but if you look closely at the photos of your see a diagonal line, and the TPU foam in the forefoot as a mostly smooth finish, where the EVA foam has a crosshatch pattern embossed on it.
  • Drop. The Endorphin 2 is zero drop (in fact, I measure it with 1mm of negative drop), which is nice to see.
  • Structure. While the endorphin 2 uses two different types of foam, these are not intended to manipulate your running form in the way that a medial post would. In fact, the endorphin is a remarkably neutral shoe, with a fairly flat shape under the heel, and very little in the way of rise under the arch of the foot.
  • Flexibility. The Endorphin is flexible due to the thin midsole combined with gaps in the outsole.
  • Outsole. The Endorphin 2 has a layer of harder, slightly sticky rubber outsole over the entire surface of the sole. This outsole is perforated with lots of triangular holes, which are easier to see as black triangles in the rear of the foot, but if you look carefully you can see these on the forefoot, revealing the TPU foam below. These gaps in the outsole help with flexibility, and I found the material they've used in the outsole to have pretty good grip.
  • Shape. Like most running shoes, the shape of the Endorphin does not match the human foot, but the endorphin is actually rather worse than most running shoes, and as noted above, I had a real problem finding a good fit. Cutting open the toe box open helps somewhat but the fit is still pretty funky. (I recommend cutting open the toe box of virtually all running shoes, with the exception of a few shoes like some Altra shoes. When you have some worn out shoes, you should try cutting open the toe box. I've found that it's a big improvement, allowing my toes to move naturally and engage for toe off, as well as reducing the possibility of blisters.)
  • Upper. The upper is thin, inflexible and seamless with absolutely no padding, but I found it surprisingly comfortable. There upper is moderately breathable, with a fine mesh reinforced by a honeycomb pattern of slightly thicker material, as you can see in the photo below.
    Saucony Endorphin 2 Upper.jpg
  • Tongue. The Endorphin 2's tongue is sown to the upper on the inside edge, which helps keep it in place. Just like its predecessor, I found the tongue is so thin I had problems avoiding it rucking up when I put the shoe on, but it never caused an issue during the run, only beforehand.
  • Lacing. The Endorphin has traditional flat laces that stayed tied nicely.
  • Heel Counter. Not surprisingly, there is no real heel counter in this shoe. There is a tiny tab that sticks up from the back of the heel, but nothing else.

3 A Comparison with other Recommended Shoes

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If you're looking for "the best of the best" running shoe, here are my top picks. Of course, the answer will depend a little on what you're looking for, so I have recommendations for various categories.

  • Best All Round Shoe. The Altra Escalante is my current all-round favorite. It has plenty of cushioning for its weight, it has a very springy midsole, it lasts well, and it has a shape that's closer to the shape of a human foot than most shoes. It's a great shoe for any runner, including those Starting to run. It's also a fairly easy shoe to find due to its popularity.
  • Best Maximalist Shoe: If you want something massively cushioned, then I'd recommend the Saucony Kinvara 8. It's remarkably light and remarkably cushioned, beating Hoka at their own game.
  • Best Optimal Shoe: For those looking to trade cushioning for speed, the Nike Zoom Streak LT is my top pick. There are lots of great optimal running shoes, which provide just enough cushioning with light weight and minimal frills. The Streak LT doesn't have the best cushioning-to-weight ratio, but it has a shape that's closer to the human foot than most running shoes and it's one of the longest lasting shoes I've found. It's not as comfy as the Escalante above, but it's faster.
  • Fastest Shoe: If you really want speed, then check out the Nike Vaporfly 4%. It's light, massively cushioned, and has a carbon fiber plate. Nothing comes close, not even the now defunct New Balance RC5000‏‎ or New Balance RC5000v2‏‎. There are a number of caveats; it's really expensive, it's really hard to find, and there's a significant injury risk.
  • Best Minimalist Shoe: Merrell Trail Glove. I recommend the trail glove for road running in spite of the 'trail' moniker. It's not a fast shoe by any means, but it's comfortable and will last well.
  • All Terrain Shoe. I don't generally review trail running shoes, but check out the Hoka Mafate if you're after a shoe with remarkable abilities on a wide range of surfaces. If you want a Hiking Boot, then I love the Hoka Tor Ultra.
  • Honorable Mention: It's not really a running shoe, but the Vivobarefoot Ra is comfortable, minimalist and can more or less pass as a dress shoe. I've worn mine to weddings with a suit and they've not looked out of place. You can run in the Ra, but the leather means it doesn't breathe well.

For a more detailed on running shoes see the Recommendations for Best Running Shoes. This table lists the key attributes of What to Look for in Running Shoes. For more detailed information, on the shoes see detailed shoe comparison.

Full Review

Brand Name Rating Recommended
price
Benefit Weight
(oz)
Penalty
(sec/mile)
Forefoot
Thickness
Heel
Thickness
Loaded Drop
mm
Cushioning Flexibility
Saucony Type A6 Review Saucony A6 Highly Recommended $100 8.2 6.1 9.5 17 21 4 5.0 7
Adidas Adios Boost 2 Review Adidas Adios Worth considering $140 4.7 8.6 13.4 17 27 11 4.0 6
Hoka Bondi 5 Review Hoka Bondi Recommended $150 6.1 11.6 18.1 38 42 5 7.1 2
Hoka Clayton 2 Review Hoka Clayton2 Highly Recommended $150 9.1 8.3 12.9 23 28 1 7.5 5
Hoka Clifton 4 Review Hoka Clifton4 Worth considering $130 7.7 9.3 14.5 30 35 10 7.2 3
On Cloudracer Review On Cloud Cloudracer Worth considering $130 5.7 8.2 12.8 19 27 5 4.7 7
Mizuno Wave Cruise Review Mizuno Cruise Worth considering $120 6.6 5.9 12.5 17 20 7 3.9 6
Newton Distance IV Review Newton Distance Worth considering $155 7.5 9.1 14.2 26 31 3 6.8 5
Asics Gel DS Racer 10 Review Asics DS Racer Worth considering $110 8.2 7.0 10.9 21 26 6 5.8 5
Mizuno Wave Ekiden 8 Review Mizuno Ekiden Worth considering $115 5.7 5.7 14.6 13 18 6 3.2 8
Saucony Endorphin 2 Review Saucony Endorphin 2 Worth considering $115 8.0 5.1 9.6 15 13 -1 4.1 8
Adidas Energy Boost Review Adidas Energy Worth considering $160 7.2 10.0 15.6 20 30 7 7.2 5
Altra Escalante Review Altra Escalante Best of the Best $130 9.1 8.7 13.5 28 25 -1 7.9 6
Saucony Fastwitch Review Saucony Fastwitch Highly Recommended $90 9.5 7.1 11.1 20 22 4 6.8 7
Topo Fli-Lyte 2 Review Topo Fli-Lyte2 Highly Recommended $100 6.7 9.1 14.2 24 26 3 6.1 5
Saucony Freedom Review Saucony Freedom Recommended $160 5.4 10.7 16.6 25 29 3 5.8 6
Skechers GORun 4 Review Skechers GORun Not recommended $100 6.1 7.5 11.7 15 23 3 4.5 7
Skechers GOrun Ultra 2 Review Skechers GRU Worth considering $90 7.5 10.0 15.6 28 34 8 7.5 4
Asics GT 2000 Review Asics GT 2000 Not recommended $120 4.8 11.2 17.4 28 35 5 5.4 2
New Balance Hanzo S Review New Balance Hanzo Worth considering $110 7.6 6.9 10.7 21 19 2 5.2 5
Hoka Hupana Review Hoka Hupana Recommended $115 6.1 8.9 13.9 31 36 7 5.4 4
Asics Gel Hyper Speed 7 Review Asics Hyper Speed Highly Recommended $75 10.9 6.3 9.8 22 26 5 6.8 6
Altra Instinct 4.0 Review Altra Instinct 4.0 Worth considering $120 6.0 9.8 15.3 29 25 -1 5.9 5
Asics Tarther Kainos 3 Review Asics Kainos Worth considering $130 10.0 6.9 10.7 17 27 9 6.8 6
Saucony Kinvara 8 Review Saucony Kinvara 8 Best of the Best $110 9.3 8.6 13.4 26 31 3 8.0 5
Nike LunarSpider R5 Review Nike LunarSpider Recommended $125 6.9 6.7 10.4 17 21 3 4.6 6
Hoka Mafate Speed Review Hoka Mafate Best of the Best $170 7.6 11.9 18.5 39 40 4 9.0 1
Pearl Izumi EM Road N0 v2 Review Pearl N0 Highly Recommended $100 7.9 6.5 10.1 14 20 4 5.2 8
Saucony Nomad Review Saucony Nomad Worth considering $110 4.3 10.5 17.2 25 27 2 4.5 4
Hoka Odyssey Review Hoka Odyssey Highly Recommended $130 8.5 9.4 14.6 37 45 5 8.0 3
Altra One 3.0 Review Altra One Recommended $100 6.1 8.8 13.7 23 23 0 5.4 6
Asics Piranha SP 5 Review Asics Piranha Recommended $100 10.1 4.2 6.5 11 15 3 4.2 9
Brooks PureFlow 5 Review Brooks PureFlow Worth considering $110 6.0 9.7 15.1 26 29 5 5.8 8
Salming Race Review Salming Race Worth considering $130 6.9 6.5 10.1 16 19 4 4.5 6
New Balance RC1600 v2 Review New Balance RC1600 Highly Recommended $110 8.8 5.6 8.7 15 21 5 4.9 8
New Balance RC5000v2 Review New Balance RC5000v2 Best of the Best $125 14.2 4.0 6.2 13 21 6 5.7 7
Skechers GoRun Ride 3 Review Skechers Ride Worth considering $85 5.9 8.5 13.2 18 28 6 5.0 8
Nike RN Distance 2 Nike RNDist2 Review Pending $120 8.0 9.2 14.3 25 28 4 7.4 7
Inov-8 RoadXTreme 220 Review Inov-8 RXT-220 Worth considering $120 5.2 8.0 18.2 14 17 3 4.2 8
Topo ST-2 Review Topo ST-2 Highly Recommended $90 8.2 7.3 11.4 20 18 0 6.0 7
Hoka Stinson Lite Review Hoka Stinson Highly Recommended $160 7.3 11.6 18.1 35 40 6 8.5 0
Nike Zoom Streak LT 3 Review Nike Streak LT Best of the Best $80 8.8 5.4 8.4 16 21 4 4.8 5
Adidas Takumi Sen 3 Review Adidas Takumi Sen 3 Highly Recommended $160 7.7 6.6 10.2 17 21 4 5.1 5
Altra Torin 2.0 Review Altra Torin Worth considering $125 5.8 9.6 14.9 28 25 -1 5.5 4
Hoka Tracer Review Hoka Tracer Recommended $130 7.2 7.4 11.5 21 24 2 5.3 5
Merrell Trail Glove 4 Review Merrell Trail Glove 4 Best of the Best $100 3.4 8.4 23.8 13 13 0 2.8 10
Topo Tribute Review Topo Tribute Recommended $100 5.9 7.3 11.4 20 18 -1 4.3 6
Mizuno Wave Universe 5 Review Mizuno Universe Highly Recommended $125 10.7 3.1 10.6 9 12 1 3.3 9
Merrell Vapor Glove 3 Review Merrell Vapor Glove 3 Highly Recommended $85 2.1 6.1 27.6 6 5 0 1.3 10
Nike Vaporfly 4% Review Nike Vaporfly Best of the Best $250 10.4 7.2 11.2 25 37 8 7.5 2
New Balance Vazee Pace Review New Balance Vazee Pace Worth considering $110 6.0 8.6 13.4 18 24 6 5.2 5
Asics TartherZeal 3 Review Asics Zeal Worth considering $140 10.9 6.3 9.8 17 27 9 6.8 6
Saucony Zealot 3 Review Saucony Zealot3 Recommended $130 8.9 9.5 14.8 29 32 4 8.5 6
Nike Zoom Fly Review Nike Zoom Fly Worth considering $150 8.3 8.7 13.5 29 36 8 7.2 3

It's not a running shoe, but I love the Hoka Tor Ultra hiking boot and I've tested the Altra Lone Peak Boot, the Hoka Tor Speed 2, and the Inov-8 Roclite 325 hiking boots
Older shoe reviews: Saucony Hattori Review, Mizuno Cursoris Review, Skechers GO Bionic 2 Review, Hoka Clifton Review, Saucony Virrata 2 Review, Brooks PureCadence 3 Review, Brooks PureConnect 3 Review, Brooks PureFlow 3 Review, Skechers GO Bionic 2 Review, New Balance 980 Review, Brooks Transcend 2 Review, Hoka Huaka Review, Patagonia EVERlong Review, Asics 33-DFA Review, Hoka Conquest Review, Saucony Cortana Review, Puma Faas 100 R Review, Saucony Fastwitch Review, Nike Free Review, Asics Gel Lyte 33 Review, Skechers GOmeb Speed Review, Skechers GOrun Ultra Road Review, Nike LunaRacer Review, Altra Paradigm Review.