Our verdict

adidas ultra boost x mystery ruby stone gold resurrects the original hardwood silhouette from the '80s, and it bursted with anything and everything retro. The velcro strap, a trademark of the Adidas Forum kicks, kept our feet comfortably tucked in during our wear tests. We also loved how our lab results confirmed this shoe's durability. Generally, the Forum Low helped us tackle big tasks throughout the day while keeping us comfy during lazy hours.

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  • Ageless look
  • Grab-and-go style
  • True blue retro
  • Supportive
  • Well-cushioned
  • Not cheaply made
  • Durable upper
  • Affordable

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Audience verdict

94
Superb!

Who should buy

We wear-tested the adidas ultra boost x mystery ruby stone gold. We also subjected it to numerous lab tests. Based on the results that we gathered, we conclude that this Adidas sneaker is greatly suitable for the following:

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  • sneakerheads who want shoes that are made of durable genuine leather
  • users who love flexible shoes

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The adidas ultra boost x mystery ruby stone gold surely packed up a bit more weight than usual. We felt it, and our weighing scale confirmed what we experienced.

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And if you don't mind other brands of lifestyle trainers, consider the ASICS Gel Lyte III (12.8 oz/361g) among other lightweight trainers.

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Heel stack

The adidas ultra boost x mystery ruby stone gold had a slightly low profile. We could feel the ground just a tad bit more while wearing this sneaker. Also, the thinner midsole allowed us to enjoy more stability.

True enough, our calliper measured the heel to be only 27.0 mm thick, a number that is slightly lower than the average.

adidas ultra boost x mystery ruby stone gold Heel stack
Test results
Forum Low 27.0 mm
Average 30.2 mm
Compared to 93 trainers
Number of shoes
16.9 mm
Heel stack
50.5 mm

Forefoot stack

Just like the heel, the forefoot felt thinner than usual as well. Our calliper measured it to be only 14.5 mm thick, significantly less than our recorded average.

adidas ultra boost x mystery ruby stone gold Forefoot stack
Test results
Forum Low 14.5 mm
Average 19.1 mm
Compared to 93 trainers
Number of shoes
9.7 mm
Forefoot stack
29.5 mm

Drop

The elevation difference between the heel and forefoot areas was not so pronounced. It felt just like the typical sneaker, and we didn't have issues with heel-to-toe transitions.

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adidas ultra boost x mystery ruby stone gold Drop
Test results
Forum Low 12.5 mm
Average 11.1 mm
Compared to 93 trainers
Number of shoes
3.5 mm
Drop
17.2 mm

Midsole softness

Note: a low durometer measurement equals a soft material, whereas a high measurement means it's firm.

Despite its being thinner, the midsole was still able to deliver considerable softness and impact protection. It was such a pleasure to walk and run in it, even for longer periods.

Our HA durometer in the lab gave it a rating of 23.5, a number far lower (therefore softer) than our average on record.

adidas ultra boost x mystery ruby stone gold Midsole softness
Test results
Forum Low 23.5 HA
Average 29.0 HA
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Compared to 75 trainers
Number of shoes
15.0 HA
Midsole softness (soft to firm)
46.4 HA

Insole thickness

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adidas ultra boost x mystery ruby stone gold Insole thickness
Test results
Forum Low 4.5 mm
Average 5.1 mm
Compared to 93 trainers
Number of shoes
3.1 mm
Insole thickness
11.5 mm

Size and fit

Size

adidas ultra boost x mystery ruby stone gold is true to size (335 votes).

Owners of this shoe, how does this shoe fit?

1 size small ½ size small True to size ½ size large 1 size large
Compared to 109 trainers
Number of shoes
½ size small
Slightly small
True to size
Slightly large
½ size large

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This retro sneaker from Adidas brings no surprises when it comes to fit. Our medium-width feet felt comfortable and received sufficient toe space in the Forum Low.

To see how the kick stacks up against other trainers, we poured a mould of its interiors using a custom gel substance. Once the replica was solid, we used a digital calliper to measure its dimensions. The widest area (between the pinkie and the big toe) showed an above-average reading of 94.6 mm confirming our initial impressions.

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Test results
Forum Low 94.6 mm
Average 92.3 mm
Compared to 74 trainers
Number of shoes
85.4 mm
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96.8 mm

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The shoe's balanced fit is complemented by a very mildly tapered toebox shape. Measuring its width near the big toe returned another slightly higher than average reading of 70.7 mm.

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Test results
Forum Low 70.7 mm
Average 68.8 mm
Compared to 74 trainers
Number of shoes
63.9 mm
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74.1 mm

Toebox height

There is no compression from the top either. The adidas ultra boost x mystery ruby stone gold showed a standard vertical height of 28.5 mm.

adidas ultra boost x mystery ruby stone gold Toebox height
Test results
Forum Low 28.5 mm
Average 27.7 mm
Compared to 74 trainers
Number of shoes
20.7 mm
Toebox height
35.0 mm

Stability

Lateral stability test

We could say that the adidas ultra boost x mystery ruby stone gold was moderately supportive. We didn't have issues with it as we shifted our weights from one side to the other. 

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Torsional rigidity

Much of the stability that we enjoyed was because of the pretty rigid base. There was not a point during our wear tests where we had to second guess our steps or worry about painful foot twists.

We manually twisted the shoe in the lab, and we realised that we needed a lot of effort to make it yield. A score of 4 out of 5 for torsional rigidity was truly warranted.

Test results
Forum Low 4
Average 3.6
Compared to 92 trainers
Number of shoes
1
Torsional rigidity
5

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The heel counter performed similarly to the base: it was stiff and was able to keep the rearfoot in place at all times. We gave it a good squeeze in the lab, and it got a rating of 4 out of 5.

Test results
Forum Low 4
Average 3.2
Compared to 92 trainers
Number of shoes
1
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5

Midsole width - forefoot

The platform of the shoe felt enough (or perhaps even a bit more) for us. We didn't slide out of the footbed, and we did not experience any wobbliness whatsoever. 

Hence, it was a bit of a surprise for us when our calliper measured the forefoot area of the platform to be 104.2 mm. This number makes the adidas ultra boost x mystery ruby stone gold slightly narrower than average.

adidas ultra boost x mystery ruby stone gold Midsole width in the forefoot
Test results
Forum Low 104.2 mm
Average 108.5 mm
Compared to 93 trainers
Number of shoes
95.1 mm
Midsole width - forefoot
121.0 mm

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The heel, for its part, was just around the average at 82.0 mm wide.

adidas ultra boost x mystery ruby stone gold Midsole width in the heel
Test results
Forum Low 82.0 mm
Average 83.6 mm
Compared to 93 trainers
Number of shoes
67.7 mm
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103.1 mm

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When we had to tiptoe to reach for something up above, it was quite easy for us because the Forum Low did not have a lot of resistance to our flexions.

adidas forum low flexibility 21244589 main

We subjected it to our standard flexibility test, and we found out that it needed only 18.2N of force to bend at 90 degrees. A typical sneaker would need more than that!

Test results
Forum Low 18.2N
Average 23.4N
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Compared to 93 trainers
Number of shoes
5.8N
Flexibility <> Stiffness
51.8N

Weight

We have to admit, the adidas ultra boost x mystery ruby stone gold felt a little heavier than the usual sneakers. The scale in the lab pegged its weight to be 16.4 ounces or 465 grams. 

adidas forum low weight 21240631 main
Test results
Forum Low 16.40 oz (465g)
Average 13.79 oz (391g)
Compared to 93 trainers
Number of shoes
8.50 oz (241g)
Weight
20.49 oz (581g)

Breathability

Though it was not the most breathable, the adidas ultra boost x mystery ruby stone gold was still quite reliable when it came to ventilation. We never reached a point where our socks were already soaking wet from the heat and profuse sweating.

We performed our breathability smoke test on it and we found that much of the ventilation was through the tongue, very reminiscent of the k swiss adidas lawsuit scam phone number adidas up town center contact number.

There were ventilation holes in the toebox and the sidewalls, but they didn't do much during the smoke test as seen in the video above. However, when the upper was put over a light source, the light successfully passed through the holes.

To be fair, the inward flow of air was OK when we were walking or running. The air vents were effective in this regard. Hence, a solid 3 was what the adidas ultra boost x mystery ruby stone gold deserved.

adidas ultra boost x mystery ruby stone gold upper microscope

We also viewed the upper under the microscope, and it became clear just how opaque the material is. Without the air vents, this would have been a pretty toasty one.

adidas ultra boost x mystery ruby stone gold Breathability
Test results
Forum Low 3
Average 3
Compared to 92 trainers
Number of shoes
1
Breathability
5

Durability

Leather/Suede quality

Our doubts about the authenticity of the leather were lessened when we viewed the upper under the microscope. Our doubts were erased after we did the fire test.

Aside from the strong smell of burning hair during the test, the material was pretty much resistant to rose. Probing the burnt area with our awl and seeing that it remained intact led us to conclude that the leather was real.

Test results
Forum Low Real leather

Toebox durability

The leather upper endowed the adidas ultra boost x mystery ruby stone gold with pretty impressive durability. We were quite harsh with this shoe during our wear-tests, and it barely showed any signs of wear and tear.

Even our high-pressure Dremel drilling was no match for the sturdiness of this sneaker's upper. It only left a non-threatening scratch in the topmost layer of the upper. Hence, a perfect 5 for toebox durability was warranted.

adidas ultra boost x mystery ruby stone gold Toebox durability
Test results
Forum Low 5
Average 3.7
Compared to 92 trainers
Number of shoes
1
Toebox durability
5

Heel padding durability

The heel padding also showed amazing resistance to our hand-held Dremel. 

If it were human, the heel padding would be left only with ruffled hair after the Dremel was pressed on it. There was no serious damage! Hence, we do not have any doubt about its capacity to withstand intense rubbing against the skin or sock. It surely deserved the 4 out of 5 that we dished out for it.

adidas ultra boost x mystery ruby stone gold Heel padding durability
Test results
Forum Low 4
Average 3.2
Compared to 92 trainers
Number of shoes
1
Heel padding durability
5

Outsole hardness

The outsole of the adidas ultra boost x mystery ruby stone gold did not feel especially firm or soft. True enough, the reading was 83.4 when we pressed our HC durometer on it. This number did not deviate that much from the average.

adidas ultra boost x mystery ruby stone gold Outsole hardness
Test results
Forum Low 83.4 HC
Average 85.7 HC
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Compared to 92 trainers
Number of shoes
76.1 HC
Outsole hardness
94.0 HC

Outsole durability

This Adidas sneaker delivered moderate durability. We used this shoe on rough outdoor surfaces, and it held up so well. Still, we didn't think that frequent usage on rough surfaces would be a good idea.

We pressed our wildly rotating Dremel against the outsole and the dent that it left was 1.2 mm deep, which roughly equates to the average.

adidas ultra boost x mystery ruby stone gold Outsole durability
Test results
Forum Low 1.2 mm
Average 1.1 mm
Compared to 92 trainers
Number of shoes
0.0 mm
Outsole wear
2.0 mm

Outsole thickness

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adidas ultra boost x mystery ruby stone gold Outsole thickness
Test results
Forum Low 6.0 mm
Average 5.3 mm
Compared to 93 trainers
Number of shoes
2.9 mm
Outsole thickness
8.6 mm

Misc

Grip / Traction

Gripping the floor was never an issue with the adidas ultra boost x mystery ruby stone gold. We were able to securely plant our feet to maintain our stances or stabilise our gaits. 

adidas ultra boost x mystery ruby stone gold outsole grip

Tongue padding

The tongue of the adidas ultra boost x mystery ruby stone gold was of average thickness at 7.9 mm. We appreciated how it felt so nice and comfortable on top of our feet.

adidas ultra boost x mystery ruby stone gold Tongue padding
Test results
Forum Low 7.9 mm
Average 9.3 mm
Compared to 93 trainers
Number of shoes
0.7 mm
Tongue padding
23.0 mm

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The sides of the tongue were not at all connected to the upper. This design allowed us to move more freely. We also believe that this design is the main reason breathability wasn't compromised.

adidas forum low tongue gusset type 21240627 main
Test results
Forum Low None

Heel tab

This sneaker from Adidas did not have heel tab. We didn't have problems going in and out of it, though.

adidas ultra boost x mystery ruby stone gold Heel tab
Test results
Forum Low None

Removable insole

The insole was removable, and it was quite convenient for those who wanted more space inside the shoe.

adidas ultra boost x mystery ruby stone gold Removable insole
Test results
Forum Low Yes

Interior Padding

The upper has sufficient padding that ensured our comfort as we walked and ran around. The upper's thickness also helped with the fit.