Size Guide How to Measure INCH CM Lightweight Waffle Knit Size Chart Size Length (in) Chest (in.) Sleeve Length (in) XS 25 18.5 29 S 26 19.5 30 M 27 20.5 31 L 28 21.5 32 XL 29 22.5 33 XXL 30 23.5 34 XXXL 31 24.5 35 If you anticipate that MEN'S FOREVER LIGHTWEIGHT THERMAL - BLOODSTONE 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 provided in the chart are specific widths in inches (e.g., 18.5 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 provided are specific lengths in inches (e.g., 29 inches for XS).When selecting a size, ensure that each measurement is comfortable for you, especially in thermals, as they are typically worn close to the body. The measurements in the chart refer to the garment's dimensions, not the body's measurements, so choose a size that allows for comfortable movement and layering. Report an issue.