Do Under Armour tops run small?

    Runs small

    Under Armour tops run small. Compression and HeatGear tops run very small. Loose-fit styles are closer to true to size. Size up 1 for a relaxed fit.

    Need sizing help for Under Armour tops?

    Tops notes

    Get a personal size recommendation for Under Armour 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.

    Under Armour Tops sizing

    Under Armour tops run small. Compression and HeatGear tops run very small. Loose-fit styles are closer to true to size. Size up 1 for a relaxed fit.

    Best starting point

    Size up once in Under Armour tops if you want an easy everyday fit.

    Cut note

    Compression and HeatGear tops run very small.

    Examples

    Think tees, blouses, knits, and lightweight layering pieces.

    Which size should I buy?

    Default to sizing up in Under Armour tops if you want an easy everyday fit. Size up 1 for a relaxed fit.

    Choose the slimmer feel

    Stay at your usual size only if you want a neater fit and feel comfortable in closer-fitting cuts.

    Choose the roomier feel

    Go up one size for breathing room, especially when this category uses closer-fitting cuts.

    Variability and caveats

    When Under Armour can feel different from the usual sizing tendency

    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

    Styling details like intended silhouette, layering room, and line-specific fit can shift how the brand’s usual sizing direction feels.

    Under Armour Tops size chart

    Compare measurements side-by-side using the label rows below.

    Fit notes below call out cut and measurement differences that matter most on smaller screens.

    SizeBustWaistHipsEUUK
    XS
    		31–33"23–25"33–35"32-344-6
    S
    		33–35"25–27"35–37"368
    M
    		35–37"27–29"37–39"38-4010-12
    L
    		37–39"29–31"39–41"4214
    XL
    		39–41"31–33"41–43"4416

    Measurements are shown in inches where numeric values are available.

    Chart footnotes

    • Loose-fit styles are closer to true to size
    • Size up 1 for a relaxed fit

    Under Armour tops usually run small.

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