Under Armour Kids Size Chart: Finding the Perfect Fit for Your Young Athlete

Finding the right size for your child's athletic wear can be challenging, especially when shopping online. Under Armour's commitment to performance apparel extends to their youth line, but understanding their sizing system is crucial for ensuring your young athlete gets the comfort and functionality they need. This comprehensive guide will help you navigate the Under Armour kids size chart, understand key measurements, and make confident purchasing decisions for your child's activewear needs.

Understanding Under Armour's Youth Sizing System

Under Armour organises their children's clothing into distinct size categories that correspond to different age ranges and body types. The brand typically divides youth sizing into several key segments: Toddler (2T-4T), Little Kids (4-7), and Big Kids (8-20). Each category has specific measurement guidelines that help parents determine the most appropriate size for their child.

The sizing system takes into account height, weight, chest measurements, and waist measurements to provide a comprehensive fit. Unlike some brands that rely primarily on age as a sizing indicator, Under Armour emphasises actual body measurements to ensure a more accurate fit across their performance-oriented clothing line.

Key Measurements for Accurate Sizing

When using the Under Armour kids size chart, you'll need to measure several key areas of your child's body. The chest measurement is taken around the fullest part of the chest, ensuring the tape measure is parallel to the floor. For waist measurements, measure around the natural waistline, typically the narrowest part of the torso.

Height measurements should be taken without shoes, with your child standing straight against a wall. Hip measurements are particularly important for bottoms and should be taken around the fullest part of the hips. These precise measurements ensure that the athletic wear will move naturally with your child during physical activities.

Toddler Sizes: Ages 2-4

Under Armour's toddler sizing ranges from 2T to 4T, designed for children who are beginning to develop their motor skills and engage in more active play. The 2T size typically fits children with a height of 33-35 inches and weight of 28-32 pounds. The chest measurement for this size ranges from 20-21 inches.

Size 3T accommodates slightly larger toddlers, with height ranges of 36-38 inches and weights between 32-36 pounds. The chest measurement increases to 21-22 inches, while the waist measurement typically ranges from 19.5-20.5 inches.

The largest toddler size, 4T, is designed for children measuring 39-41 inches in height and weighing 36-41 pounds. The chest measurement for 4T ranges from 22-23 inches, with a corresponding waist measurement of 20.5-21.5 inches.

Little Kids Sizes: Ages 4-7

The Little Kids category bridges the gap between toddler and youth sizing, covering sizes 4 through 7. This range accommodates children who are becoming more active in organised sports and outdoor activities. Understanding these measurements becomes particularly important as children begin participating in activities where proper fit affects performance and comfort.

Size 4 typically fits children with heights between 39-42 inches and weights of 35-41 pounds. The chest measurement ranges from 22-23 inches, while the waist measures approximately 20.5-21.5 inches.

Moving up to size 5, the height range expands to 42-45 inches with weights between 41-46 pounds. Chest measurements increase to 23-24 inches, and waist measurements range from 21-22 inches.

Size 6 accommodates children measuring 45-48 inches in height and weighing 46-53 pounds. The chest measurement for this size ranges from 24-25 inches, with waist measurements of 21.5-22.5 inches.

The largest size in this category, size 7, fits children with heights of 48-51 inches and weights between 53-60 pounds. Chest measurements range from 25-26 inches, while waist measurements span 22-23 inches.

Big Kids Sizes: Ages 8-20

Under Armour's Big Kids sizing covers the most extensive range, from size 8 through 20, accommodating children and teenagers who are actively involved in sports and require performance-oriented athletic wear. This sizing category is particularly important for parents shopping for children participating in competitive sports or regular training activities.

Sizes 8-10 represent the transition from little kid to youth sizing. Size 8 typically fits children with heights of 51-54 inches and weights between 60-68 pounds. The chest measurement ranges from 26-27 inches, with waist measurements of 22.5-23.5 inches.

Size 10 accommodates children measuring 54-57 inches in height and weighing 68-78 pounds. Chest measurements increase to 27-28.5 inches, while waist measurements range from 23.5-24.5 inches.

The larger sizes in this category, from 12-20, are designed for teenagers and adolescents. Size 12 typically fits individuals with heights of 57-60 inches and weights between 78-88 pounds. As sizes increase, the measurements continue to expand proportionally to accommodate growing bodies while maintaining the athletic fit that Under Armour is known for.

Special Considerations for Athletic Fit

Under Armour designs their youth clothing with athletic performance in mind, which means the fit may differ from casual clothing brands. The athletic fit is typically more streamlined and closer to the body, designed to move with the child during physical activities without restricting movement or causing chafing.

When selecting sizes, consider the type of activity your child will be engaging in. For high-intensity sports or activities requiring a full range of motion, you may want to ensure there's adequate room for movement while still maintaining the performance benefits of a properly fitted garment.

How to Measure Your Child Accurately

Taking accurate measurements is crucial for successful online shopping. According to Federal Trade Commission guidelines, understanding sizing before purchasing can help reduce returns and ensure satisfaction with online purchases.

Start by having your child stand in their underwear against a flat wall. Use a flexible measuring tape and ensure it's snug but not tight against their body. For chest measurements, have your child take a normal breath and measure around the fullest part of their chest, keeping the tape parallel to the floor.

Waist measurements should be taken at the natural waistline, which is typically the narrowest part of the torso. For hip measurements, measure around the fullest part of the hips, ensuring the tape remains parallel to the floor. Record all measurements and compare them to the official Under Armour size chart before making your selection.

Common Sizing Mistakes and How to Avoid Them

One of the most common mistakes parents make when shopping for children's athletic wear is relying solely on age or current clothing size from other brands. American Academy of Pediatrics research shows that children's growth patterns can vary significantly, making actual measurements far more reliable than age-based sizing.

Another frequent error is choosing sizes that are too large, thinking children will "grow into" the clothing. While some room for growth is reasonable, oversized athletic wear can actually hinder performance and comfort during physical activities. Under Armour's moisture-wicking and compression technologies work best when the garment fits properly against the skin.

Additionally, parents sometimes forget to account for different fits across product lines. Under Armour offers various fits including loose, fitted, and compression styles. Each fit type may require slightly different sizing considerations, so always check the specific product's fit description alongside the size chart.

Special Considerations for Different Product Types

Different Under Armour products may have unique sizing considerations beyond the standard size chart. For example, compression garments are designed to fit more snugly and may require careful attention to the child's comfort level. Base layers and thermal wear often have different fit requirements compared to outer layers or casual athletic wear.

Footwear sizing follows a completely different chart and measurement system. Under Armour kids' shoes should be measured while the child is standing, as feet tend to expand slightly under body weight. There should be approximately a thumb's width of space between the longest toe and the front of the shoe to accommodate growth and prevent discomfort during athletic activities.

When shopping for seasonal items, consider layering needs. Winter athletic wear may need to accommodate base layers underneath, while summer items should focus on breathability and moisture management. National Heart, Lung, and Blood Institute guidelines emphasise the importance of proper clothing for safe physical activity in various weather conditions.

When to Size Up or Down

While accurate measurements are essential, there are situations where you might consider sizing slightly up or down from your child's measured size. If your child is between sizes and actively growing, sizing up may provide a longer usable life for the garment. However, avoid going more than one size larger, as this can compromise the performance benefits of properly fitted athletic wear.

For children who prefer a looser fit or are sensitive to tight clothing, consider Under Armour's loose fit options rather than sizing up in fitted styles. The brand designs different fits to accommodate various comfort preferences while maintaining performance features.

If you're purchasing for a special event or competition where optimal performance is crucial, stick to the recommended size based on measurements. The enhanced performance features of Under Armour's athletic wear work best when the garment fits as intended by the design specifications.

Making the Right Choice for Your Young Athlete

Successfully navigating the Under Armour kids size chart requires attention to detail and understanding your child's specific needs. By taking accurate measurements, considering the intended use of the garment, and understanding the brand's athletic fit philosophy, you can make confident purchasing decisions that will serve your young athlete well.

Remember that proper fit not only enhances comfort and performance but also contributes to your child's confidence and enjoyment of physical activities. Investing time in understanding sizing will help ensure that your child gets the maximum benefit from their Under Armour athletic wear.

For expert advice on athletic wear for young athletes and access to competitive pricing on top brands, explore our youth sports collection at More Sports. Our team understands the importance of proper fit for performance and can help you find the right size for your child's needs. With our comprehensive selection and customer support services, you can shop with confidence knowing you're getting quality athletic wear at competitive prices.

Whether your child is just starting their athletic journey or competing at higher levels, the right fit makes all the difference in their comfort, performance, and overall experience. Take the time to measure accurately, understand the sizing system, and choose wisely for your young athlete's success. For more tips on selecting the best athletic wear for children, check out our comprehensive guide to youth sports equipment and apparel.

Visit More Sports today for expert guidance and competitive prices on Under Armour kids' athletic wear. Our Northern Ireland location ensures fast shipping throughout the UK and Europe, with free shipping on orders over £25.