Size Guide How to Measure INCH CM Heavyweight Waffle Knit Size Chart Size Length (in) Chest (in.) Sleeve Length (in) XS 23 18 27 S 24 19 28 M 25 20 29 L 26 21 30 XL 27 22 31 XXL 28 23 32 XXXL 29 24 33 If you anticipate that MEN'S FOREVER HEAVYWEIGHT THERMAL - BLACK may not fit as expected, please refer to our return policy to ensure you're order is valid to exchange. LengthMeasure from the highest point of the shoulder down to where you want the thermal to end on your body.This will give you the total length of the garment as per your preference.ChestMeasure around the fullest part of your chest.Keep the measuring tape horizontal and ensure it's not too tight.The chest measurements in the chart are specific widths in inches (e.g., 18 inches for XS).Sleeve LengthMeasure from the top of your shoulder down to your wrist.Alternatively, you can measure from the base of your neck, over your shoulder, and down to your wrist for a more comprehensive sleeve length.The sleeve length measurements in the chart are specific lengths in inches (e.g., 27 inches for XS).Make sure each measurement is comfortable for you, especially since thermals are typically worn close to the body. These measurements refer to the garment's dimensions, so select a size that allows for comfortable movement and layering. Report an issue.