Base Layer Size Charts: Helpful Guidelines
Comprehensive Overview of Base Layer Size Chart: Our detailed size charts are designed to help customers make informed decisions about their Base Layer purchases. Each chart provides essential measurements and helpful guidelines, ensuring you select the perfect fit for your needs. Whether you’re browsing or using our user-friendly resources, this guide will empower you to make informed choices with confidence and ease.
Universal Base Layer Size Chart
| Size | Chest (in/cm) | Waist (in/cm) | Hip (in/cm) | Note |
|---|---|---|---|---|
| Junior Small (JS) | 26–28 / 66–71 | 24–26 / 61–66 | 26–28 / 66–71 | Youth sizing |
| Junior (J) | 28–30 / 71–76 | 26–28 / 66–71 | 28–30 / 71–76 | Youth sizing |
| Youth (Y) | 30–32 / 76–81 | 28–30 / 71–76 | 30–32 / 76–81 | Youth sizing |
| Small (S) | 34–36 / 86–91 | 28–30 / 71–76 | 34–36 / 86–91 | Adult |
| Medium (M) | 38–40 / 97–102 | 32–34 / 81–86 | 38–40 / 97–102 | Adult |
| Large (L) | 42–44 / 107–112 | 36–38 / 91–97 | 42–44 / 107–112 | Adult |
| X Large (XL) | 46–48 / 117–122 | 40–42 / 102–107 | 46–48 / 117–122 | Adult |
| 2X Large (XXL) | 50–52 / 127–132 | 44–46 / 112–117 | 50–52 / 127–132 | Adult |
| 3X Large (XXXL) | 54–56 / 137–142 | 48–50 / 122–127 | 54–56 / 137–142 | Adult |
| Size | Bust (in/cm) | Waist (in/cm) | Hip (in/cm) | Note |
|---|---|---|---|---|
| Junior Small (JS) | 24–26 / 61–66 | 22–24 / 56–61 | 26–28 / 66–71 | Youth sizing |
| Junior (J) | 26–28 / 66–71 | 24–26 / 61–66 | 28–30 / 71–76 | Youth sizing |
| Youth (Y) | 28–30 / 71–76 | 26–28 / 66–71 | 30–32 / 76–81 | Youth sizing |
| Small (S) | 32–34 / 81–86 | 26–28 / 66–71 | 34–36 / 86–91 | Adult |
| Medium (M) | 36–38 / 91–97 | 28–30 / 71–76 | 38–40 / 97–102 | Adult |
| Large (L) | 40–42 / 102–107 | 32–34 / 81–86 | 42–44 / 107–112 | Adult |
| X Large (XL) | 44–46 / 112–117 | 36–38 / 91–97 | 46–48 / 117–122 | Adult |
| 2X Large (XXL) | 48–50 / 122–127 | 40–42 / 102–107 | 50–52 / 127–132 | Adult |
| 3X Large (XXXL) | 52–54 / 132–137 | 44–46 / 112–117 | 54–56 / 137–142 | Adult |
The table above provides a Universal Base Layer Size Chart, covering sizes from Junior through to Adult 3X Large. It is designed to give a clear overview of typical base layer sizing based on chest, waist, hip, and bust measurements in both centimetres and inches. This makes it easier to find the right fit across age groups when shopping online.
However, please note that sizing can vary slightly between brands, so this chart should be used as a general reference only. If a specific product has a brand-supplied size guide, you’ll find it listed in the product description—we recommend referring to that first for the most accurate fit.
Considering More Than Just Size
In addition to measurements, it is also important to consider the fabric, thickness, and intended use of base layers. For example:
- Cotton or cotton-blend base layers – Comfortable and breathable, suitable for everyday wear, but may shrink slightly after washing.
- Thermal or wool base layers – Thicker and warmer, ideal for cold weather or outdoor sports, but may fit more snugly.
- Stretch or blended fabrics – Include elastane or spandex for flexibility, helping the garment fit close to the body.
- Performance or athletic base layers – Often feature moisture-wicking fabrics, compression support, or added stretch for enhanced comfort and mobility during sports or exercise.
Choosing the Right Size
- If you’re between sizes or unsure, we generally recommend sizing up for added comfort.
- This is particularly helpful for growing children, youth sizes, or when wearing thicker or performance fabrics.
Why This Guide Matters
We know that finding the right base layer size can sometimes be a challenge — especially with the wide range of brands, each using their own measurement systems. That’s why we’ve created this comprehensive Base Layer Size Chart Guide to help you make confident, informed decisions when shopping online with us.
Final Note
This general guide is a helpful starting point, but it’s important to remember that base layer sizes can vary slightly between brands, styles, and fabric types. Whenever possible, we strongly recommend checking the brand-specific size guides provided on our product pages for the most accurate fit.
✅ Pro Tips for Measuring Base Layers
- Measure chest/bust: Wrap a tape measure around the fullest part of your chest or bust, keeping the tape level and snug but not tight.
- Measure waist: Wrap around the natural waistline comfortably.
- Measure hips: Wrap around the widest part of the hips for a proper fit.
- Account for stretch: Fabrics with elastane or spandex may fit a range of sizes.
- Think about intended use: Performance layers may fit tighter, while casual or thermal layers may be looser for comfort.
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When in doubt, size up: Especially useful for youth or thicker performance fabrics to ensure comfort and mobility.
Brand-Specific Size Guides
On our website, you’ll find these brand-specific size guides directly under the product description on each product page. These charts are provided by the manufacturers and are the most accurate reference for that particular brand. If a brand-specific guide is listed, we encourage you to follow it rather than relying solely on this general chart.
Below is a list of brands currently stocked by A7 Sports, each offering its own brand-specific size chart for reference:
X Base Layer Size Chart
Our inventory is continuously updated to feature the latest product lines, technological advancements, and seasonal collections from leading global brands. We work closely with top manufacturers to ensure our customers have timely access to new releases and high-performance gear as soon as they hit the market.
For the most up-to-date selection, including limited editions and seasonal launches, we recommend checking back regularly or subscribing to our updates.
Note: Brand availability may vary based on current stock and specific product lines. For the most accurate and up-to-date information, please refer to the individual product pages or contact our customer service team directly.
Still have questions? Our customer support team is happy to help—feel free to reach out before placing your order.