GEL-NIMBUS 20 (D) is rated 4.4 out of 5 by 8.
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  • Size Guide
  • Width Guide

Shoe sizes on product details pages are in US shoe size.

MEN'S SIZES                                              
US 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 14 15 16 17
UK 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 13.5 14  15 16
EU 36 37 37.5 38 39 39.5 40 40.5 41.5 42 42.5 43.5 44 44.5 45 46 46.5 47 48 49 50.5 51.5 53
CM 22.5 23 23.5 24 24.5 25 25.25 25.5 26 26.5 27 27.5 28  28.25 28.5 29 29.5 30 30.5 31 32 33 34
WOMEN'S SIZES                              
US 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 13
UK 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 11
EU 36 37 37.5 38 39 39.5 40 40.5 41.5 42 42.5 43.5 44 44.5 46
CM 22.5 23 23.5 24 24.5 25  25.25 25.5 26 26.5 27 27.5 28  28.5 29
KIDS' SIZES                                  
US K4 K5 K6 K7 K8 K9 K10 K11 K12 K13 1 2 3 4 5 6 7
EU  19.5  21  22.5 23.5 25 26 27 28.5 30 31.5 32.5 33.5 35 36 37.5 39 40
CM  12  13 13.5 14.5 15 16 17 17.5 18.5 19.5 20 21 22 22.5 23.5 24.5  

Toddler (TS): Sizes K4-K9
Pre-School (PS): Sizes K10 - 3
Grade School (GS): Sizes 1-7

MEN'S BOXING SHOES                                    
US 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 13 14 15 16 17 18
EU 37.5 38  39  39.5 40.5 41.5 42 42.5  43.5 44 45 46 47 49   51.5 53 54
CM    24.5  25  25.5 26 26.5   27  27.5 28 28.5 29  30 30.5   33 33.5 34.5


The standard (medium) width for women is B, while the standard width for men is D. Shoe boxes and labels will only identify widths other than standard. Within the shoes, wide and narrow widths are identified on the label, underneath the tongue — ie. T005N(2E).

When is additional width needed?
Visible stretching or bulging on the outsides of forefoot materials is a good indicator that additional width may be needed. These sizes are available in many of our Running and Training shoes. In some cases, men can wear women’s styles to achieve a narrow fit and women can wear men’s to get a wide. If this is needed, please use the references above to determine comparable size lengths. Please note that the differences of width between narrow, standard, wide, and extra wide are usually only a couple millimeters and are proportional to the size of the shoe. Most additional width will be found in the forefoot.

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Product Details

The GEL-Nimbus 20 is celebrating 20 years as a staple shoe for neutral runners. It features a NEW 3D print in the upper combined with gradient mesh, allowing for more room in the toe area, whilst also providing flex and support through the midfoot. This fluid skin upper is designed to adapt to the runner's foot, while strategic overlays seamlessly wrap and support the foot throughout any run. Top this off with Flytefoam and Spevafoam in the midsole for a plush and cushioned ride in a lighter seamless package.

Running Experts Club Icon

This shoe belongs to our exclusive Running Experts Club Collection.

Shoe Technologies:

  • 3M Reflective
  • AHAR Heel Plug
  • AHAR Rubber Sponge Outsole
  • External Heel Clutch
  • FlyteFloam™ Midsole Technology
  • Gender Specific Cushioning (Women's +3mm)
  • Guidance Line® Midsole Technology
  • Guidance Trusstic System® Technology
  • I.G.S® Technology (Running)
  • SpEVA® 45 Lasting
  • Spevafoam Topplayer


Pronation is part of the natural movement of the human body and refers to the way your foot rolls inward for impact distribution upon landing. Understanding your pronation type can help you find a comfortable running shoe. ASICS GEL-NIMBUS 20 (D) is made for neutral.
  • OVER
How Your Foot Contacts the Ground
The foot lands on outside of the heel, then rolls inward (pronates) to absorb shock and support body weight.
Push Off
There is even distribution from the front of the foot.
Considered Injuries
Less likely due to effective shock absorption, but neutral runners are not immune to injury.
Foot Type
Normal size arches


ASICS ships Monday-Friday, excluding public holidays.

We deliver to mainland Australia and Tasmania. We are excited to offer FREE* shipping to these regions.

Once dispatched, we aim to deliver your order within 2 - 5 business days. Regional areas may take longer.

Our carrier, Startrack, does not deliver to the following locations: Parcel Lockers, Locked Bags, GPO Boxes, Airports and/or Prisons.

Click here for more information about shipping.

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Rated 5 out of 5 by from A Godsend! I would like to start off by saying I am NOT a runner. However, I am a school teacher and am on my feet ALL day! About 6 months ago I began having trouble with my left hip. Pain radiating down my leg to the point that I was limping. We tried exercises, hot / cold packs and finally a shot. I then developed plantar fasciitis in my left foot, probably from limping so much because of my hip. Again, exercises, hot / cold packs and massages for my foot. Next, came tendon stress on the top of my left foot which caused hot, shooting pains, constant dull ache and swelling, sometimes from my toes to about halfway up my calf. I was then x-rayed to see if I had somehow obtained a fracture. I had not. I wore a walking boot for 3 weeks to try and stabilize the tendon and take some stress off while it hopefully healed. It didn't work. I was finally sent to Dr. Penny Lawin in Jackson, MS. She gave me a list of shoes that some of her patients recommend due to the success they achieved. The Asics Gel Nimbus 20 was on that list. I tried them on in the store and immediately loved the way they felt on my foot, very snug and secure. I have only been wearing them about a week and my pain, from my toes all the way up to my hip, is almost COMPLETELY GONE! I am telling everyone about these shoes! You don't have to be a runner to receive the benefits. Thank you for a quality product that delivers what it says! I will definitely purchase these again!
Date published: 2018-04-16
Rated 4 out of 5 by from Great fit and quality! I bought these runners to replace my old Kayanos. Not having worn Nimbus before I was a little skeptical they would offer the same amount of support, however I have been pleasantly surprised. There is plenty of cushioning in the back and middle of the shoe however it is lacking in the forefoot. Whilst I can notice that the arch support is not as prominent in this neutral shoe, I don't feel it affects my running or training. I have noticed though that I need to tie the laces extremely tight in order for the shoe to feel secure and the tongue not to slide as the last laces position is quite low, however this isn't a deal breaker. The colours are nice and the fit is great, however I think when I am due for new shoes I will go back to my Kayanos for all over cushioning.
Date published: 2018-04-14
Rated 5 out of 5 by from Love Gel Nimbus are the only shoe I can wear and they don't hurt my feet. I ordered in Wide cause of reviews saying they was too narrow. I'm glad I did wide.
Date published: 2018-03-29
Rated 5 out of 5 by from Wide enough for my poor feet These are a close fit to the gel nimbus 18, which were great for me! Lightweight and comfortable. Only the one color option but at least it's more subtle than most asics!
Date published: 2018-03-06
Rated 1 out of 5 by from Tight forefoot This shoe is exquisite except that it is too tight in the forefoot/toe area even in the women’s wide size. There are two plastic overlays that may be constricting the shoe in that area. I wish ASICS would start making their shoes in extra wide for women. I’ve worn ASICS gel- cumulus for a log time but had to stop with model 16. I considered trying to cut the light blue plastic things but opted instead to return the shoes. These shoes would be perfect if only they had more room in toe box. The toe box is constrictive rather than just tight!
Date published: 2018-02-21
Rated 5 out of 5 by from Love it! Super cushioned and great for running, especially for a novice like me. They do run narrow but once you get the right fit they are fantastic!
Date published: 2018-02-19
Rated 5 out of 5 by from Feels like I'm walking on a Cloud! I bought the gel-nimbus 20 women shoes online about a month ago. Kept them about 3 weeks before I started wearing them outside because I didn't know if I needed to go to a bigger size. They fit snug. I wear a 8 1/2 or a 9 depending on the shoe. I went to the store to try on a 9 but the 9 was too roomy. So I kept the 8 1/2 and concerned my toe area fit to small. I could use a little more room as my toes feel a little tight together. I would definitely need the 9 if I used a insert. This shoe fits small but it is very comfortable to walk on. Feels like a cloud which must be the gel. 1st time ordering these and I'll use them for everyday walking. Hopefully they will break in a little bit after wearing them for a while. I love the dark blue color which is what attracted me to this shoe first.
Date published: 2018-01-12
Rated 5 out of 5 by from It took two returns to get a pair that fitted. Smaller fitting shoe than most, but once you get correct size, they are the most comfortable cushioned shoe. Absolutely love them for my daily walks.
Date published: 2018-01-06
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