My son is 14 years weight 100 pounds what is his size

He'd be between a L and XL, depending on waist size. I'd say L for an average build, XL if waist is larger build. 100 pounds at 14 sounds closer to L though. Hope this helps.

What size is the xlarge youth

I would say size 16. My son wears XL in Nike pants, size 16 dress pants, and wears YXL underwear. Hope this helps!

my grandson wears a size 6 so what size underwear will that be...s,m, l???

Hi, It depends... is he skinny or husky? According to the Under Armour chart, he’d be an XS, but if he’s on the huskier side, get small.

Boxer Brief Underwear Big Kid

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Description

⚡ Gear up for unstoppable comfort and performance!

BUILT TO LAST - Premium materials ensure durability that stands up to active lifestyles and repeated washes.
PERFECT FIT EVERY TIME - Available in sizes X-Small to X-Large, designed to grow with your child’s active needs.
PERFORMANCE GRADE FABRIC - Lightweight, breathable cotton blend engineered for superior moisture-wicking and odor control.
ATHLETIC FIT ALL DAY COMFORT - Slimmer, stretch-fit design moves with every play and keeps your kid comfortable from dawn to dusk.
TRUSTED BY TEENS PARENTS ALIKE - Highly rated and loved for comfort and fit—your kid’s new go-to for sports and everyday wear.

Under Armour Boys Charged Stretch Boxer Jocks deliver a high-performance, athletic fit with 4-way stretch fabric that enhances mobility. Crafted from breathable, lightweight cotton with antimicrobial wicking, these boxers keep young athletes cool and fresh all day. Durable and designed for active boys, they come in a convenient 2-pack and a full size range, making them a top choice for comfort, longevity, and style.

Specifications

ASIN	B07Q5T2SG1
ASIN	B0714BNVJG
Additional Features	Lightweight,Stretch
Age Range Description	Big Kid
Apparel Fabric Stretch	High Stretch
Apparel Fabric Weight Class	Lightweight
Best Sellers Rank	#12,341 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #121 in Boys' Boxer Briefs
Bottom Style	Boxer Briefs,Boxers
Brand Name	Under Armour
Color	Mod Gray
Customer Reviews	4.7 4.7 out of 5 stars (8,518)
Date First Available	July 12, 2017
Department	boys
Fabric Type	57% Cotton, 38% Polyester, 5% Spandex
Fit Type	Streamlined fit that’s not too tight or too loose.
Fit to Size Sentiment	positive
Item Type Name	Boxer Briefs
Item Weight	0.33 Pounds
Item model number	2 Pack Solid Cotton Boxer Briefs
Manufacturer	Under Armour
Manufacturer	Under Armour Children's Apparel
Manufacturer Part Number	2527X67019-06-PC-006-YSM
Material Type	Cotton
Number of Items	4
Package Dimensions	7.4 x 5.6 x 1.4 inches; 2.7 ounces
Pattern	Solid
Product Care Instructions	Machine Wash
Rise Style	Mid
Size	Small
Sport Type	outdoor_lifestyle
Style Name	Multipack Performance Cotton Boxerjock Brief, Lightweight & Smooth Stretch Fit
Style Number	2527X67019-06-PC
Subject Character	Sports
Theme	Sports
UPC	193579416737
Unit Count	4.0 Count

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