This lightweight tri-blend is the perfect combination of fabric for the softest shirts. At 4.3 oz, the shirts are made from 50% polyester, 25% combed ring spun cotton, and 25% rayon. Ring spun cotton yarn is made by continuously twisting and thinning the fibers, which makes a stronger yarn with significant softness. Rayon is a durable fine fiber and polyester supplies strength and shape retention while drying quickly, making this shirt versatile for varying activity levels. The fabric is pre-laundered to reduce shrinkage so you can be confident in ordering the appropriate size.