Measurements are provided by suppliers. 

Pro tip! Measure one of your products at home and compare with the measurements you see in this guide.A LengthPlace the end of the tape beside the collar at the top of the tee (Highest Point Shoulder). Pull the tape measure to the bottom of the shirt.B WidthPlace the end of the tape at the seam under the sleeve and pull the tape measure across the shirt to the seam under the opposite sleeve.C Sleeve lengthPlace one end of the tape at the top of the set-in sleeve, then pull the tape down until you reach the hem of the sleeve.

Measure your head circumference with a non-stretchable measuring tape. Place the end of your tape on your forehead and wrap the rest around the back of your head, keeping it 1″ (2.5 cm) above your ears. Pinch the spot where the tape meets the other end, lift the loop over your head, and note the measurement. Be as careful as possible to get the most precise measurement.