As someone who works closely with OEM factories that produce performance apparel for global sports brands, one of the most common sizing questions I hear is:
“Does Under Armour run small?”
Here’s the simple, beginner-friendly breakdown based on real production experience.
Table of Contents
- Quick Answer
- 1. How Under Armour Sizing Usually Fits
- 2. Under Armour Size Comparison (vs Nike, Adidas)
- 3. Best Size to Choose by Product Type
- 4. Who Should Size Up or Down
- FAQs
- Related Links
Quick Answer
Yes — Under Armour generally runs small, especially in compression, fitted tops, and training apparel.
If you prefer a relaxed or standard fit, you’ll likely need to size up.
From my OEM experience, UA intentionally designs garments with a “performance-tight” silhouette to enhance mobility and moisture-wicking.
External references:
- UA Size Guide: https://www.underarmour.com
- UA Official Store: https://www.underarmour.com/en-us/
1. How Under Armour Sizing Usually Fits
✔ When UA runs small
- compression shirts
- fitted training tops
- performance tights
- base layers
✔ True to size
- hoodies
- joggers
- shorts
- loose-fit tees
✔ Runs slightly larger
- some men’s loose-fit tops
OEM Insight:
UA uses tighter pattern blocks to improve stretch and sweat performance — this is why many consumers feel the clothes run smaller than Nike or Adidas.
2. Under Armour vs Nike vs Adidas (Sizing Feel)
| Brand | Fit Feel | Notes |
|---|---|---|
| Under Armour | Smaller / tighter | Best for athletes; compression is very tight |
| Nike | True to size | Slightly slim but more forgiving |
| Adidas | True to size / slightly loose | More relaxed in lifestyle models |
Key Takeaway
If you are used to Nike or Adidas sizing, UA will feel tighter by comparison.
3. Best Size Choice by Product Type
| Product Category | Recommended Sizing | Why |
|---|---|---|
| Compression tops | Size up | UA compression is extremely tight |
| Fitted tees | True to size or size up | Depends on body type |
| Training tights | Size up | Small waist & hip block |
| Shorts | True to size | More relaxed cut |
| Hoodies / jackets | True to size | Standard athletic fit |
OEM Insight:
The tightness mainly comes from UA’s narrow chest and waist grading increments.
4. Who Should Size Up or Down
✔ Size Up if:
- you prefer comfort instead of tight fit
- you’re between sizes
- you lift weights and have broader shoulders
- you’re buying UA compression or fitted tops
✔ Stick to True Size if:
- you like performance-tight silhouettes
- you’re buying hoodies or joggers
Internal Link
If you’re creating your own sportswear line and want UA-level fit consistency:
👉 https://fukigymwear.com
FAQs
Q1: Do Under Armour shoes run small?
Most UA shoes fit true to size, but some training models feel narrow.
Q2: Does Under Armour compression fit like regular clothing?
No. Compression is meant to be tight — size up for daily comfort.
Q3: Is UA tighter than Nike?
Yes, especially in tops and tights.
Q4: Are UA size charts accurate?
Yes, but the fit style (compression/fitted) makes clothes feel smaller.
Related Links
- UA Size Guide: https://www.underarmour.com
- UA Compression Gear: https://www.underarmour.com/en-us/c/mens/clothing/compression/
- Performance Activewear Manufacturing: https://fukigymwear.com
