I always use LL Bean long sleeve t-shirts because they don't wear out and fit really well with one exception--I have an 18 inch neck and the neck hole in the XL size lately is a little snug on me so I stretch them out after each washing. If you have a neck diameter 17 inches or less, I'm sure you will love these shirts in XL.
The Carefree Unshrinkable T-Shirt, Long-Sleeve is GREAT I bought one to see if it didn't shrink and was the right size for me, I love it and I'm back to buy more. They are so comfortable and very well made. I would highly recommend this to everyone. Enjoy, I am and will.