The Kirkland Signature Men's T-shirts combine our heavyweight combed cotton fabric with reinforced seams and tagless labels to produce one of the most durable and comfortable T-shirts you have ever worn. It's just the kind of quality you'd expect from Kirkland Signature. Sizing:M-4XL Chest Circumference (in): M = 38-40 | L = 42-44 | XL = 46-48 | XXL = 50-52 | 3XL = 54-56 | 4XL = 58-60 Care Instructions: Machine wash warm Only non-chlorine bleach when needed Tumble dry on low Warm iron