Under Armour Size Guide

Men's

Men's Tops
Size	Chest	Waist
Small	34″–36″	28½″–30″
Medium	38″–40″	31½″–33½″
Large	42″–44″	35″–37″
X-Large	46″–48″	39″–41″
XX-Large	50″–52″	43″–45½″
3X-Large	54″–56″	47½″–50″
4X-Large	58″–60″	52″–54½″

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. Be careful not to squeeze too tight to allow a little give.

Men's Bottoms
Size	Waist
Small	28″–29″
Medium	30″–32″
Large	34″–36″
X-Large	38″–40″
XX-Large	42″–44″
3X-Large	44″–46″
4X-Large	46″–48″

How to Measure

WAIST: Measure around your natural waistline—right above your hips. Be careful not to squeeze too tight to allow a little give.

Men's Fit Guide

Loose

Fuller cut for complete comfort, total range of motion & greater breathability.

Fitted

A slimmer, athletic cut that allows total mobility but eliminates the bulk of extra fabric.

Compression

Ultra-tight, second-skin fit that keeps you locked in & makes you feel like you can do anything.

Women's

Women's Tops sizes
US Sizes		Bust	Waist
X-Small	0–2	32½″–33½″	25½″–26½″
Small	4–6	33½″–35½″	27½″–28½″
Medium	8–10	36½″–37½″	29½″–30½″
Large	12–14	39″–40½″	32″–33½″
X-Large	16	42″–43½″	35″–36½″
XX-Large	18	45″–46½″	38″–39½″

How to Measure

BUST: 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 where your hips start. Be careful not to squeeze too tight to allow a little give.

Women's Bottoms sizes
US Sizes		Waist	Hips
X-Small	0–2	23″–25″	33″–35″
Small	4–6	25½″–27½″	35½″–37½″
Medium	8–10	28″–30″	38″–40″
Large	12–14	30½″–32½″	40½″–42½″
X-Large	16	33″–35″	43″–45″
XX-Large	18	36″–38″	46″–48″

How to Measure

WAIST: Measure around your natural waistline—right where your hips start. Be careful not to squeeze too tight to allow a little give.

HIPS: With your feet together, measure around the fullest part of your hips to ensure you'll have enough room to move comfortably.

Women's Fit Guide

Loose

Fuller cut for complete comfort, total range of motion & greater breathability.

Fitted

A slimmer, athletic cut that allows total mobility but eliminates the bulk of extra fabric.

Semi-Fitted

A slimmer, athletic cut that delivers optimal mobility by eliminating the bulk of extra fabric.

Compression

Ultra-tight, second-skin fit that keeps you locked in & makes you feel like you can do anything.

Boy's

Boy's sizes
US Sizes		Chest	Waist	Height
YX-Small	6–6X	24″–25″	23″–23½″	46″–48½″
YSmall	7–8	25½″–26½″	23½″–24½″	50″–54″
YMedium	10–12	27½″–28½″	25½″–26½″	55½″–58½″
YLarge	14–16	30½″–32″	28″–29½″	61½″–64″
YX-Large	18–20	33½″–35″	31″–32½″	66½″–69″

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. Be careful not to squeeze too tight to allow a little give.

Little Boy's Sizes
US Sizes	Chest	Waist	Height
4	21½″–22½″	21¼″–22½″	38″–41″
5	22½″–23½″	22″–23″	41″–44″
6	23½″–24½″	22½″–23½″	44″–46½″
7	24½″–26″	23″–24″	46½″–50″

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 where your hips start. Be careful not to squeeze too tight to allow a little give.

Boy's Fit Guide

Loose

Full, loose fit for enhanced range of motion & breathable comfort no matter where your workout takes you.

Fitted

Sits close to the skin for a streamlined fit without the squeeze of compression.

Girl's

Girls's Sizes
US Sizes		Chest	Waist	Height
YX-Small	6–6X	24″–25″	23″–23½″	46″–48½″
YSmall	7–8	26″–27″	23½″–24½″	50½″–52½″
YMedium	10–12	28½″–30″	25″–26″	55″–58″
YLarge	14–16	31½″–33½″	28″–30″	61″–62½″
YX-Large	18–20	35½″–37½″	32″–34″	62½″

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. Be careful not to squeeze too tight to allow a little give.

Little Girl's Sizes
US Sizes	Chest	Waist	Height
4	21½″–22½″	21¼″–22½″	38″–41″
5	22½″–23½″	22″–23″	41″–44″
6	23½″–24½″	22½″–23½″	44″–46½″
6x	24½″–25″	23″–23½″	46½″–48½″

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 where your hips start. Be careful not to squeeze too tight to allow a little give.

Girls's Fit Guide

Loose

Full, loose fit for enhanced range of motion & breathable comfort no matter where your workout takes you.

Fitted

Sits close to the skin for a streamlined fit without the squeeze of compression.

Toddlers/Infant

Toddler sizes
US Sizes	Chest	Waist	Height	Weight
2T	20″–21″	20½″–21½″	33″–35″	29 lbs–33 lbs
3T	20½″–21½″	21″–22″	35″–38″	32 lbs–36 lbs
4T	21½″–22½″	21½″–22½″	41″–44″	38 lbs–42 lbs
5T	22½″–23½″	22″–23″	41″–44″	38 lbs–42 lbs

Infant sizes
US Sizes	Chest	Height	Weight
0–3 M	15½″–17″	20½″–24″	8 lbs–12 lbs
3–6 M	17″–18″	24″–27″	12lbs–16lbs
6–9 M	18″–18½″	27″–29″	16 lbs–20 lbs
12 M	18½″–19″	29″–30½″	18 lbs–22 lbs
18 M	19″–20″	30½″–33″	22 lbs–26 lbs
24 M	20″–21″	33″–35″	26 lbs–30 lbs

Headwear

Adjustable Cap Size
Size	Head
Men's OSFA	22-23½
Women's OSFA	21¼-22¾
Youth OSFA	20⅞-22⅜

Stretch-Fit sizes
Size	Head
S/M	20⅞″–21½″
M/L	22″–23″
L/XL	23″–24¼″
XL/XXL	24¼″–25½″

How to Measure

HEAD: To figure out your UA fitted hat size, measure the circumference of your head where your hat will rest. If you don't have a tape measure, use a string and measure it against a ruler. Find your measurement on the size chart to determine your ideal UA hat size.