Mid-weight 8.25 oz., 80% Ringspun Cotton, 20% Polyester. Heather colors may differ in content.UNISEX SIZING:For Chest - Measure 1" inch below armhole, from seam to seam across chest. For Length - Measure from shoulder to bottom of shirt. Small - Chest 20" - Length 27" Medium - Chest 22" - Length 28" Large - Chest 24" - Length 29" X-Large - Chest 26" - Length 30" XX-Large - Chest 28" - Length 31" XXX-Large - Chest 30" - Length 32"