There are 3 choices of material to choose from:

Basic T-shirt: 5.4 oz, 50/50 cotton/poly T-shirt with advanced moisture management (29M/29B or 8000/8000B)

Heavier Basic T-Shirt: 6.1 oz 100% cotton T-shirt (2000/2000B))

Softer/Lighter T-shirt: 4.3 oz, 50/50 combed ring spun cotton (softer)/50 poly (DM108) Youth shirts in this style are made of 4.3 oz, 100% combed ring spun cotton (DT6000Y)