The sizing chart refers to actual body measurements in inches.
Garment measurements are larger to allow 'EASE' of fit.         
  MASCULINE FIT S M L XL 2XL 3XL 4XL 5XL
 Masculine Wicking Polo (chest) 35-38" 39-41" 42-44" 45-48" 49-52" 53-56" 57-60" 61-64"
  FEMININE FIT XS S M L XL 2XL 3XL
 Feminine Wicking Polo (chest) 30-32" 33-35" 36-38" 39-41" 42-44" 45-47" 48-50"