River Birch Cotton Long Sleeve T-ShirtRiver Birch Cotton Long Sleeve T Shirt 5. 3 ounce, 100% US cotton 90 10 cotton poly (Sport Grey) Non topstitched, classic width, rib collar Tearaway label Taped neck and shoulders Rib knit cuffs HOW TO MEASURE CHEST WIDTH Measure under the arm and around the fullest part of the chest with arms down, keeping tape horizontal. SIZE CHART S M L XL 2XL 3XL Chest 34 36 38 40 42 44 46 48 50 52 54 56