We took our sweat-wicking, keeps-you-cool technology and turned it into the best underwear in the game. Our men's boxershorts feel cool, stay put, and provide a zero-distraction fit that's snug, but not tight.

4-Way Stretch
Fast-Drying

Product Details

Lightweight, smooth HeatGear® fabric for superior performance
4-way stretch material moves better in every direction
Material wicks sweat & dries really fast
Chafe-free seams & no-ride up legs for ultimate comfort
Elastic waistband

Size & Fit

Fitted: Streamlined fit that’s not too tight or too loose.

Size & Fit Guide

How to measure

CHEST: Place 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.

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

Size Chart

Size Chart (Centimeters)
Size	US Sizes	CHEST (cm)	WAIST (cm)	HIPS (cm)	HEIGHT (cm)
YXS	7	63 - 66	58 - 61	66 - 69	119 - 128
YSM	8	66 - 69	61 - 63	69 - 71	128 - 135
YSM+	8+	70 - 74	69 - 71	74 - 77	128 - 135
YMD	10 - 12	69 - 74	63 - 69	71 - 79	135 - 150
YMD+	10+/12+	74 - 79	71 - 79	77 - 85	135 - 150
YLG	14 - 16	74 - 83	69 - 76	79 - 86	150 - 165
YLG+	14+/16+	79 - 88	79 - 86	85 - 93	150 - 165
YXL	18 - 20	83 - 90	76 - 84	86 - 94	165 - 178
YXL+	18+/20+	88 - 95	86 - 94	93 - 100	165 - 178

Size Chart (Inches)
Size	US Sizes	CHEST (in)	WAIST (in)	HIPS (in)	HEIGHT (in)
YXS	7	25 - 26	23 - 24	26 - 27	47 - 50½
YSM	8	26 - 27	24 - 25	27 - 28	50½ - 53
YSM+	8+	27.5 - 29	27 - 28	29 - 30½	50½ - 53
YMD	10 - 12	27 - 29	25 - 27	28 - 31	53 - 59
YMD+	10+/12+	29 - 31	28 - 31	30½ - 33½	53 - 59
YLG	14 - 16	29 - 32.5	27 - 30	31 - 34	59 - 65
YLG+	14+/16+	31 - 34.5	31 - 34	33½ - 36½	59 - 65
YXL	18 - 20	32.5 - 35.5	30 - 33	34 - 37	65 - 70
YXL+	18+/20+	34.5 - 37.5	34 - 37	36½ - 39½	65 - 70

Specs & Care

Style #: 1383915
3 per pack
Inseam: 4"
90% Polyester/10% Elastane
Imported
Machine wash cold with like colors
Use only non-chlorine bleach when needed
Tumble dry low
Do not iron
Do not use softeners
Do not dry clean

Reviews(42)

4.9

Recommended: 95%

42 Ratings

Comfort

Min

Max

Fit

Runs Small

Runs Large

Performance

Min

Max

What Customers Are Saying:

The reviews for these children's underwear are overwhelmingly positive.
Customers describe the product as comfortable, breathable, and well-fitting.
Many parents note their children love wearing these and refuse to wear any other brand.
The soft, stretchy fabric, perfect fit, and ability to keep the wearer cool and dry are highlighted.
Some customers recommend sizing up as the product runs a bit small.
Overall, the consensus is that this is a high-quality, comfortable, and durable children's underwear.

This AI generated summary is based on real customer reviews.

Great product

Hawk85

last month

My son absolutely loves these. Will be back to get more.

Comfort

Min

Max

Fit

Runs Small

Runs Large

Performance

Min

Max

Location: Greenville SC

Reviews: 1

Votes: 0

MoreLess

Helpful?

Perfect for my active 8 year old

DMC100397

last month

My son loves these underwear! I got him a couple packs for Christmas, soon after I realized he was favoring these! He asked me to buy him a couple more! He’s 55 lbs and a YSM fits perfectly.

Comfort

Min

Max

Fit

Runs Small

Runs Large

Performance

Min

Max

Location: Newmarket, NH

Reviews: 1

Votes: 0

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Helpful?

Perfect boxer briefs

Jersey Bergers

3 months ago

My sons love these boxers. They're comfortable and stylish.

Comfort

Min

Max

Fit

Runs Small

Runs Large

Performance

Min

Max

Location: Flemington, NJ

Reviews: 1

Votes: 1

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Helpful?

Q&A(1)

Is this 1 pair or 3 pair

Henricus

20 days ago

Hi, there! Our UA Performance Tech™ boxerjocks come in a three-pack.

UA Expert Heather V.

20 days ago

Helpful?

How would you rate our products and descriptions?

UA Performance Tech™Boys' 4" Boxerjock®

Product Description

UA Performance Tech™
Boys' 4" Boxerjock®