Lululemon Shirt Mens XL Teal Long Sleeve Casual Athletic Tee Athleisure Stretch All sizes are estimations only. Please consult your existing wardrobe to compare measurements with your favorite articles. SIZE & MEASUREMENT DETAILS Size: XL Length (Top Collar to Bottom Seam): ~ 30" Length is measured by fully extending the garment and starting at the top / back of the color. This is just above or right where the makers tag usually begins. Collars and hoods are not used for the length measurement. Jean length measurements are captured from the crotch area end seam beginning to the leg seam ending. Width (Left Seam to Right Seam): ~ 22" Width is captured by fully stretching out the garment left to right and starting the ruler under the left arm seam and then stopping at the right arm seam. If this measurement is a little smaller than normal for your clothes, then the garment is most likely a slim or athletic cut. I try to call this out but some items don't always have tags or markers. I ship quickly and if you have any questions, please do not hesitate to ask. Cheers, Michael