It is very important that you measure and get the right size!
Please double check before placing order. Lay the garment down flat and measure across from armpit-to-armpit. Below are the WIDTH measurements in inches.

CLASSIC-FIT: standard normal, relaxed fitting
SLIM-FIT: runs small, modern formed fitting to body

Unisex/Mens tees & tanks XS S M L XL 2XL
Classic-fit tee width  n/a 18 20 22 24 26
Slim-fit tee width 16 17 19 21 23 25
Womens tees & tanks S M L XL 2XL
Relaxed-fit tee width 17 19 21 23 25
Slim-fit “juniors” tee width 16 17 18 19 20
F5 Challenge Performance Tees S M L XL 2XL
Unisex active shortsleeve width 20 22 24 25 26
Ladies active v-neck shortsleeve width 17.25 18.25 19.25 20.75 22.5
Unisex active longsleeve width 18 20 22 24 26
Youth t-shirts S M L
Classic-fit tee width 17 18 19
Approximate age 6-8 10-12 13-15