You've spotted a pair of ASICS and you're not sure if you should stick with your usual size or go up half a size. This is a common question among buyers, and the answer varies by model.
ASICS offers two distinct categories: lifestyle models (Gel-1130, Gel-NYC, Gel-Lyte III) and running models (Gel-Nimbus, GT-2000, Novablast). These two categories fit differently. This guide gives you the concrete information you need to order the right size on your first try.
Do ASICS fit true to size?
Generally, ASICS fits true to size and adheres to European standards for its lifestyle models. However, for running models, it's recommended to go up half a size to allow for the natural swelling of your foot during activity.
Another important nuance: some models are slightly narrow at the front of the foot. If you have wide feet, an extra half size can enhance comfort, regardless of the category.
ASICS Size Conversion Chart
ASICS uses standard European sizes. Here are the official conversions:
Men
| Length (cm) | EU Size | UK Size | US Size |
|---|
| 22.5 | 36 | 3 | 4 |
| 23.5 | 37.5 | 4.5 | 5.5 |
| 24.5 | 39 | 5.5 | 6.5 |
| 25.5 | 40.5 | 6.5 | 7.5 |
| 26 | 41 | 7 | 8 |
| 26.5 | 42 | 7.5 | 8.5 |
| 27 | 43 | 8.5 | 9.5 |
| 27.5 | 43.5 | 9 | 10 |
| 28 | 44 | 9 | 10 |
| 29 | 45.5 | 10.5 | 11.5 |
| 30 | 47 | 12 | 13 |
Women
| Length (cm) | EU Size | UK Size | US Size |
|---|
| 21.5 | 34.5 | 2 | 4 |
| 22 | 35.5 | 2.5 | 4.5 |
| 22.5 | 36 | 3 | 5 |
| 23 | 37 | 4 | 6 |
| 23.5 | 37.5 | 4.5 | 6.5 |
| 24 | 38 | 5 | 7 |
| 24.5 | 39 | 5.5 | 7.5 |
| 25 | 39.5 | 6 | 8 |
| 25.5 | 40.5 | 7 | 9 |
| 26 | 41 | 7.5 | 9.5 |
| 27 | 42.5 | 8.5 | 10.5 |
How do ASICS lifestyle models fit?
The ASICS lifestyle models have a unique feature: their construction is directly inherited from running. It's not just about aesthetics; you can feel it in the fit and how they size. Here’s what you need to know for each silhouette.
ASICS Gel-1130
The Gel-1130 fits true to standard size. Stick with your usual size. If you have slightly wide feet, going up half a size can provide more comfort, but it's not always necessary. The front area is quite standard, and the heel support is decent.
ASICS Gel-NYC
The Gel-NYC fits true to size, with a slightly relaxed fit compared to other ASICS models. It's one of the few silhouettes from the brand that naturally accommodates slightly wider feet, thanks to its softer construction. If you're between sizes, go for the smaller one.
ASICS Gel-Kayano 14
The Gel-Kayano 14 generally fits true to size, but some wearers report discomfort at the front of the foot. If you're between sizes or have wide feet at the front, go up half a size. The heel support is excellent, and the structure is precise.
ASICS Gel-Lyte III
The Gel-Lyte III fits true to size but is slightly narrow in width. People with wide feet often need to go up half a size, sometimes a full size, for optimal comfort.
ASICS Japan S
The Japan S fits normally and remains one of the most versatile ASICS silhouettes in terms of fit. Stick with your usual size.
Lifestyle Summary
| Model | Size Advice |
|---|
| Gel-1130 | Your usual size |
| Gel-NYC | Your usual size |
| Gel-Kayano 14 | Your size, or ½ size up if wide at the front |
| Gel-Lyte III | ½ size up if wide |
| Japan S | Your usual size |
How do ASICS running models fit?
For running shoes, the rule changes. Your foot swells during activity, sometimes by a full half size on a long run. ASICS officially recommends going up half a size from your usual size for its running models. This is a habit to adopt consistently.
ASICS Gel-Nimbus
The Gel-Nimbus fits true to size with plenty of room at the front of the foot. It works well for runners with wide feet or those who need volume at the front. Going up half a size is still recommended for running, in line with the general ASICS running rule.
ASICS GT-2000
The GT-2000 is slightly narrow at the front of the foot. For running, go up half a size. If you have wide feet, this model is available in widths 2E (wide) and 4E (extra wide). Check availability on the official site or with specialized running retailers.
ASICS Novablast
The Novablast fits true to size but is slightly snug at the midfoot. For wide feet, an extra half size is recommended. The fit is responsive and well-supported, without squeezing the heel.
Running Summary
| Model | Size Advice |
|---|
| Gel-Nimbus | ½ size up |
| GT-2000 | ½ size up (or width 2E/4E) |
| Novablast | ½ size up |
ASICS and Wide Feet: What You Need to Know
Good news if you have wide feet: several ASICS models are available in extended widths, 2E (wide) and 4E (extra wide). This is especially useful for runners who struggle to find comfortable shoes in standard widths.
Models available in extended widths include the Gel-Kayano, GT-2000, and Gel-Nimbus. For lifestyle models, the usual solution is to go up half a size, as extended widths are generally not offered for these silhouettes.
If you wear orthotics, also plan to go up half a size to accommodate the added volume.
ASICS vs Nike, adidas, New Balance: How do their sizes compare?
Coming from another brand? Here’s how ASICS stacks up:
- ASICS vs Nike: ASICS tends to fit slightly smaller than Nike. If you wear a 42 in Nike, try a 42.5 in ASICS, especially for narrow models.
- ASICS vs adidas: Sizes generally correspond. A 42 in adidas is equivalent to a 42 in ASICS for most models. If you're torn between an ASICS and an adidas Samba or Gazelle, stick with your usual size.
- ASICS vs New Balance: Sizes are close. New Balance offers more width options, but EU sizes match up well.
These guidelines are starting points. The actual fit always depends on the specific model.
- Place a white sheet on the floor and put your foot on it, heel against a wall.
- Trace the outline of your foot, then measure the distance from the heel to the longest toe.
- Do this for both feet and keep the larger measurement.
- Refer to the conversion chart above to find your EU size.
Tip: measure at the end of the day (your foot is at its maximum volume), wearing the socks you plan to use. Don’t overlook this detail, especially for running models.
FAQ
Do ASICS fit small?
No, ASICS lifestyle models generally fit true to size. Some models like the Gel-Lyte III are slightly narrow, but the length corresponds to European standards. For running models, go up half a size.
Should I go up half a size with ASICS?
For running models, yes. ASICS officially recommends an extra half size for its running shoes. For lifestyle models, this is only necessary if you have wide feet or if you're between sizes.
What size should I take for ASICS Gel-NYC?
The Gel-NYC fits true to size. Stick with your usual size. If you have wide feet, going up half a size can provide more room at the front.
Are ASICS available in wide sizes?
Yes, several ASICS running models (Gel-Kayano, GT-2000, Gel-Nimbus) are available in widths 2E (wide) and 4E (extra wide). Lifestyle models generally do not offer extended widths.
How do I convert an ASICS US size to EU?
For men, add about 33-34 to the US size to get the EU size (US 9 ≈ EU 42.5). For women, add about 30-31 to the US size (US 7 ≈ EU 38). Refer to the complete conversion chart above for more accuracy.
Conclusion
For lifestyle models (Gel-1130, Gel-NYC, Japan S), stick with your usual size. For models with a snug fit at the front of the foot (Gel-Lyte III, Gel-Kayano 14), plan to go up half a size if your foot is wide. For running shoes (Gel-Nimbus, GT-2000, Novablast), the rule is simple: always go up half a size.
Before buying, use the conversion chart and measure your foot at the end of the day.
Compare ASICS prices on WhenToCop? to find the best deal on the model of your choice.