On Running tops fit true to size. True to size. Performance fit is slightly slim.
Tops notes
Get a personal size recommendation for On Running tops, accounts for the brand's cut tendency and your saved measurements.
GENERAL BRAND GUIDANCE
This is a general brand-level sizing summary, not an exact product recommendation. For your specific size, paste a product link into the fit checker.
On Running tops fit true to size. True to size. Performance fit is slightly slim.
Best starting point
Your usual size should fit well in On Running tops.
Cut note
True to size.
Examples
Think tees, blouses, knits, and lightweight layering pieces.
Start at your usual size in On Running tops, then use the cut note below to choose neater or roomier. Sizing stays consistent across On Running tops, so once you find your size it holds.
Choose the slimmer feel
Stay at your usual size for a clean fit, especially if the piece reads as closer-fitting cuts.
Choose the roomier feel
Size up only if you want extra ease or prefer this category to feel softer than typical closer-fitting cuts.
Variability and caveats
Cut
Structured pieces usually feel smaller first, especially through the shoulders, waist, or hip.
Fabric stretch
Fabric stretch changes how strongly the sizing tendency shows up: more give softens it, less give makes it more obvious.
Styling
This brand is fairly consistent, but styling can still shift the feel when a piece is meant to be sharply fitted or deliberately oversized.
Compare measurements side-by-side using the label rows below.
| Size | Bust | Waist | Hips | EU | UK |
|---|---|---|---|---|---|
XS | 32–34" | 24–26" | 34–36" | 32-34 | 4-6 |
S | 34–36" | 26–28" | 36–38" | 36 | 8 |
M | 36–38" | 28–30" | 38–40" | 38-40 | 10-12 |
L | 38–40" | 30–32" | 40–42" | 42 | 14 |
XL | 40–42" | 32–34" | 42–44" | 44 | 16 |
Measurements are shown in inches where numeric values are available.
On Running tops are usually true to size.
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