Is On Running true to size?
On Running is true to size. Most shoppers wear their usual size, especially in shoes. On Running fits true to size with a performance athletic cut. Check the category notes below for tops, bottoms, and outerwear specifically.
On Running generally runs true to size.
On Running fits true to size with a performance athletic cut.
Confidence: Medium, based on official size chart data
Sizing overview
Most shoppers start with their usual size. Use the notes below to see where On Running feels slimmer, roomier, or more consistent across categories.
On Running is true to size. Runs true to size. The Cloud and Cloudmonster have a standard width. Wide-footed runners should size up 0.5.
Plain-language cut notes and examples below show where pieces usually feel closer, roomier, or most predictable.
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 is true to size. On Running fits true to size with a performance athletic cut.
How to read On Running sizing
Sizing tendency
Most shoppers start with their usual size.
Consistency
Low variation across categories.
Best check
Start with the category note, then check whether the cut is meant to feel structured or relaxed.
Variability and caveats
When On Running can feel different from the usual sizing tendency
Cut
Cut matters most when a piece is intentionally tailored or intentionally oversized.
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.
On Running Sizing by Category
Runs true to size. The Cloud and Cloudmonster have a standard width. Wide-footed runners should size up 0.5.
What to expect
Expect shoes to follow the label fairly closely unless the piece is intentionally oversized or sharply tailored.
Performance apparel runs true to size with a technical, fitted cut.
What to expect
Expect activewear to follow the label fairly closely unless the piece is intentionally oversized or sharply tailored.
True to size. Performance fit is slightly slim.
What to expect
Expect tops to follow the label fairly closely unless the piece is intentionally oversized or sharply tailored.
True to size. Running shorts and tights fit as expected.
What to expect
Expect bottoms to follow the label fairly closely unless the piece is intentionally oversized or sharply tailored.
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Common questions about On Running sizing
Is On Running true to size?
On Running is true to size. On Running fits true to size with a performance athletic cut. Most shoppers start with their usual size.
What size am I in On Running if I wear a Medium?
A Medium at On Running is roughly the same as a Medium at most contemporary brands. Fit can vary across shoes, activewear, tops, and bottoms, so confirm against the specific category you are shopping.
Does On Running fit differently by category?
Yes. Fit varies by category at On Running, covering shoes, activewear, tops, and bottoms, since the same brand often cuts shoes and bottoms to different proportions.
Is On Running's size chart accurate?
On Running publishes an official size chart, and ThisFits cross-references it against real shopper fit reports. On Running shows low variation across categories, so the chart is a reliable starting point with adjustments based on cut.
What if I'm between sizes at On Running?
On Running fits true to size, so when you are between sizes, pick based on how close you want the cut to feel. Sizing up gives a relaxed feel and sizing down gives a more fitted silhouette.
How does On Running sizing compare to other brands?
On Running sizes similarly to H&M and Uniqlo, your usual size applies. Shoppers commonly compare On Running against other contemporary labels in the same category to translate sizes between brands they already wear.
Can I return On Running items if the size is wrong?
On Running typically accepts returns on unworn items with tags within the window stated on the order page or receipt. Policies vary by retailer and third-party sellers may differ, so confirm before ordering.