Find your correct size in the chart below.

The measurements on the size chart are body measurements in inches. 

Men's Nike Tops

  Width  Length
Small 17-18" 23-24"
Medium 19-21" 23-24"
Large 20-21" 23-26"
XL 22-24" 23-26"


Men's Under Armour Tops

  Width (Armpit to armpit) Length (Neck to hip)
Small 18-19" 22-26"
Medium 19-21" 23-26"
Large 21-22" 24-27"
XL 23-24" 25-27"


How To Measure

    • Width: Keeping the tape measure horizontal around the fullest part of your chest. Measure armpit to armpit.
    • Length: keeping the tape measure vertical. Measure from your lower neck to the lowest part of your bladder.

Fit guide

  • Tight (Size under), second-skin fit that keeps you locked in.
  • Slim (Your size), athletic cut that allows total mobility but eliminates the bulk of extra fabric.
  • Comfort (Size above), total range of motion & greater breathability.


If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If your measurements for chest and waist correspond to two different suggested sizes, order the size indicated by your chest measurement.