The Gildan 64000 series T-shirts are predominantly 100% cotton, but some colours are cotton polyester blends. The following details the exceptions:

The Antique colours (the name starts with the word Antique) and Sport Gray are 90% cotton and 10% polyester. This blend offers a vintage, deeply saturated, yet subtly muted look that mimics a classic, well-washed favourite.

The Heather colours (the name starts with the word Heather) and Dark Heather are 65% cotton and 35% polyester. Instead of a flat, solid color, heather shirts have a slightly weathered or vintage look. The heathering is incredibly fine and understated. It does not look heavily streaked with gray or white; instead, the fabric looks like a rich solid colour that has been aged naturally over time. they feel less stiff than a pure cotton shirt.

Finally, the Graphite Heather colour is 50% cotton and 50% polyester. This gives a smooth, less heathered, more corporate appearance. It is exceptionally soft right off the shelf, noticeably bypassing the slightly stiffer feel of standard solid colors. It provides excellent drape, holds its shape well, and is highly resistant to shrinking or fading in the wash.