4.5-ounce, 100% ring spun US cotton
Non-topstitched 5/8" rib collar
Taped neck and shoulders
Modern classic fit, seamless body
Double-needle sleeves and hem
Recycled, high-performing black tear-away label
 
Size Chart : 
https://catalog.companycasuals.com/p/3480_MilGreen/specSheetMeasurements