Under Armour Size Guide
Under Armour is a performance-focused sportswear brand renowned for its innovative athletic apparel, footwear, and accessories. The brand offers three distinct fit styles—Compression (ultra-tight, second-skin fit), Fitted (slimmer athletic cut), and Loose (fuller cut with greater breathability)—to suit different activity levels and preferences. Under Armour products are designed for serious athletes and active individuals across all genders and age groups, with sizing that prioritises comfort, mobility, and performance.
How to Measure
- Chest: Place the tape measure under your arms at the fullest part of your chest. Wrap around your body until your fingers meet and mark the measurement.
- Waist: Measure around your natural waistline, right above your hips. Avoid squeezing too tightly; allow a little give for comfort.
- Hips: With your feet together, measure around the fullest part of your hips to ensure you'll have enough room to move comfortably.
- Foot Length (for shoes): Trace your entire foot onto a piece of paper and measure from heel to toe in centimetres. Measure later in the day when your feet are slightly larger, and ensure your full weight is on your foot while tracing.
Men's Clothing Sizes
| Size | Chest (in) | Chest (cm) | Waist (in) | Waist (cm) |
|---|---|---|---|---|
| XS | 30–32 | 76–81 | 26.5–27.5 | 67–70 |
| S | 34–36 | 86.4–91.4 | 28–29 | 71.1–73.7 |
| M | 38–40 | 96.5–101.6 | 30–32 | 76.2–81.3 |
| L | 42–44 | 106.7–111.8 | 34–36 | 86.4–91.4 |
| XL | 46–48 | 116.8–121.9 | 38–40 | 96.5–101.6 |
| XXL | 50–52 | 127–132.1 | 42–44 | 106.7–111.8 |
| 3XL | 52–54 | 132.1–137.2 | 44–46 | 111.8–116.8 |
| 4XL | 54–56 | 137.2–142.2 | 46–48 | 116.8–121.9 |
| 5XL | 56–58 | 142.2–147.3 | 48–50 | 121.9–127 |
Women's Clothing Sizes
| Size | Bust (in) | Bust (cm) | Waist (in) | Waist (cm) | US Equivalent |
|---|---|---|---|---|---|
| XS | 32.5–33.5 | 83–85 | 25.5–26.5 | 65–67 | 0–2 |
| S | 33.5–35.5 | 88–90 | 27.5–28.5 | 70–72 | 4–6 |
| M | 36.5–37.5 | 93–95 | 29.5–30.5 | 75–77 | 8–10 |
| L | 39–40.5 | 99–103 | 32–33.5 | 81–85 | 12–14 |
| XL | 42–43.5 | 107–110 | 35–36.5 | 89–93 | 16 |
| XXL | 45–46.5 | 114–118 | 38–39.5 | 97–100 | 18 |
| 1X | 44–47 | 112–119.5 | 39–43 | 99–109 | 16W–18W |
| 2X | 48–51 | 122–129.5 | 44–48 | 112–122 | 20W–22W |
| 3X | 52–55 | 132–140 | 49–53 | 124.5–135 | 24W–26W |
Men's Footwear Sizes
| Foot Length (cm) | UK | US Men's | EU |
|---|---|---|---|
| 25–25.5 | 6–6.5 | 7–7.5 | 40–40.5 |
| 26–26.5 | 7–7.5 | 8–8.5 | 41–42 |
| 27–27.5 | 8–8.5 | 9–9.5 | 42.5–43 |
| 28–28.5 | 9–9.5 | 10–10.5 | 44–44.5 |
| 29–29.5 | 10–10.5 | 11–11.5 | 45–45.5 |
| 30–30.5 | 11–11.5 | 12–12.5 | 46–47 |
| 31–31.5 | 12–12.5 | 13–13.5 | 47.5–48 |
| 32–32.5 | 13–13.5 | 14–14.5 | 48.5–49 |
| 33–33.5 | 14–14.5 | 15–15.5 | 49.5–50 |
| 34 | 15 | 16 | 50.5 |
Product-Specific Guidance
Athletic Tops & Shirts
Under Armour tops are available in three fit styles. Compression tops provide a second-skin fit ideal for layering and high-intensity training. Fitted tops offer a slimmer, athletic silhouette with full mobility. Loose tops deliver maximum comfort and breathability for casual wear and recovery days. Check the product label or description to identify which fit style suits your intended use, then refer to the chest and waist measurements above to select your size. If your measurements fall between two sizes, consider the fit style: Compression typically runs smaller, so size up if you prefer a less restrictive feel.
Bottoms (Trousers & Shorts)
Measure your natural waist (above the hips) and hip circumference at the fullest point. Under Armour bottoms use consistent waist and hip measurements across all styles. For men, waist sizes range from 26.5 inches (XS) to 50 inches (5XL). For women, sizes range from 25.5 inches (XS) to 53 inches (3X). Avoid over-tightening the tape measure to ensure accurate, comfortable fit.
Running & Training Shoes
Accurate foot measurement is critical for footwear. Trace your foot on paper later in the day when your feet are naturally slightly larger, with your full weight on the foot. Measure from heel to toe in centimetres. If your measurement falls between two sizes, Under Armour recommends sizing up. Footwear typically runs true to size across EU, UK, and US designations, though metric-to-imperial conversions may result in one UK size equalling two US sizes in some ranges.
Gloves
Glove sizing is based on hand length and hand circumference in centimetres. Men's gloves range from XS (hand length 17–18 cm) to XXL (20–21 cm). Women's gloves range from XS (15.2–15.9 cm) to XL (19.1–19.7 cm). Measure your dominant hand for the most accurate fit.
Headwear & Hats
Most Under Armour headwear is sized by head circumference in centimetres, typically measured around the fullest part of the head, just above the ears and eyebrows. Unisex and adjustable options may be available in one-size-fits-most or size ranges like S/M, M/L, and L/XL.
Sizing Tips
- Understand fit styles: Compression is ultra-tight for performance; Fitted is slimmer with good mobility; Loose is relaxed and breathable. Choose based on activity type and personal preference, not size label alone.
- Measure in the evening: Feet and body measurements can swell during the day. Measure your feet in late afternoon or evening for the most accurate shoe size.
- Allow for layering: If you plan to wear Under Armour tops under jackets or over base layers, measure your actual chest and consider whether you need extra room. Fitted styles may feel tight over layers.
- Size up if between measurements: Under Armour recommends sizing up if your measurements fall between two sizes, particularly for footwear and Compression fits.
- Check product descriptions: Many items specify which fit style (Compression, Fitted, or Loose) they represent. Fit varies across product categories, so never rely on size label alone when shopping multiple items.
- Account for shrinkage: Always check care instructions. Machine washing and tumble drying can cause minor shrinkage in some Under Armour fabrics; consider air drying to preserve fit and longevity.
- Women's sizing includes extended sizes: Under Armour offers extended sizes (1X, 2X, 3X) in women's clothing. These maintain consistent waist-to-hip proportions across the size range, so the transition between standard and extended sizing is seamless.