Gildan Ultra Cotton T-Shirts Gildan Ultra Cotton (2000): At 200 grams, this is one of the thickest Gildan shirts, so if you want a toasty t-shirt, this is the one for you. It comes in a variety of colors, and some of the more basic colors also run up to 5XL, so go for the Ultra if you need larger sizes. Gildan Heavy Cotton T-Shirts Gildan Heavy Cotton (1800/2800): At 180 grams, these are two of the thicker Gildan shirts, perfect for fall and winter days when you want something warm but not too heavy. They come in a wide variety of colors and sizes, so check out Gildan's website to find what fits you best. Gildan Super Cotton T-Shirts Gildan Super Cotton (1400/2300): These are two of the thinner Gildan shirts but they still offer pretty good quality at around 150 grams each. Gildan Premium Cotton T-Shirts Gildan Premium Cotton (1000/1700): At 1020 grams, these are one of the thinner Gildan shirts but they're still very comfortable to wear.