Does Under Armour run small?
Under Armour runs small. Most shoppers size up from their usual size, especially in tops. Under Armour runs small, size up 0.5 in most categories Check the category notes below for tops, bottoms, and outerwear specifically.
Under Armour generally runs small.
Under Armour runs small, size up 0.5 in most categories
Confidence: Medium, based on official size chart data
Sizing overview
Most shoppers start one size up. Use the notes below to see where Under Armour feels slimmer, roomier, or more consistent across categories.
Under Armour runs small. Compression and HeatGear tops run very small. Loose-fit styles are closer to true to size. Size up 1 for a relaxed fit.
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.
Under Armour runs small. Under Armour runs small, size up 0.5 in most categories
How to read Under Armour sizing
Sizing tendency
Most shoppers start one size up.
Consistency
Variation depends on the category.
Best check
Start with the category note, then check whether the cut is meant to feel structured or relaxed.
Variability and caveats
When Under Armour 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
Styling details like intended silhouette, layering room, and line-specific fit can shift how the brand’s usual sizing direction feels.
Under Armour Sizing by Category
Compression and HeatGear tops run very small. Loose-fit styles are closer to true to size. Size up 1 for a relaxed fit.
What to expect
Expect tops to feel closer than the label suggests, especially in more structured pieces.
Athletic shorts and joggers run small in the waist. Size up 1. Storm pants are slightly more generous.
What to expect
Expect bottoms to feel closer than the label suggests, especially in more structured pieces.
Storm and ColdGear jackets run small through the chest and arms. Size up 1 for layering room.
What to expect
Expect outerwear to feel closer than the label suggests, especially in more structured pieces.
How does Under Armour sizing compare to other brands?
Under Armour runs small. Compared to similar brands shoppers frequently compare against:
Compare Brands
Common questions about Under Armour sizing
Does Under Armour run small?
Under Armour runs small. Under Armour runs small, size up 0.5 in most categories Most shoppers start one size up.
What size am I in Under Armour if I wear a Medium?
If you wear a Medium in standard contemporary sizing, plan to try a Large at Under Armour first, especially in structured or fitted pieces. Fit can vary across tops, bottoms, and outerwear, so confirm against the specific category you are shopping.
Does Under Armour fit differently by category?
Yes. Fit varies by category at Under Armour, covering tops, bottoms, and outerwear, since the same brand often cuts tops and outerwear to different proportions.
Is Under Armour's size chart accurate?
Under Armour publishes an official size chart. ThisFits cross-references it against real shopper fit reports across Under Armour's catalog to surface where real-world fit differs from the chart.
What if I'm between sizes at Under Armour?
Since Under Armour tends to run small, sizing up usually means fewer returns when you are between sizes, especially for fitted tops and tailored bottoms.
How does Under Armour sizing compare to other brands?
Under Armour sizes similarly to Zara and COS, many customers prefer the next size up. Shoppers commonly compare Under Armour against other contemporary labels in the same category to translate sizes between brands they already wear.
Can I return Under Armour items if the size is wrong?
Under Armour 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.