We covered dye sublimation in a previous post. That process is what we use across our performance polyester line, and it works because of the chemistry between heat-activated dye and synthetic fiber. But polyester is not the only material we work with. For cotton, the process is entirely different. The printing process we use to custom cotton based apparel is called direct to garment printing, DTG for short.
What DTG Is
Direct to garment printing is exactly what the name says. A specialized inkjet printer applies water-based ink directly onto the surface of a finished garment. No transfer paper. No screen. No vinyl. The design goes from a digital file to the fabric in one pass.
The printers used for DTG operate on the same basic principle as a standard inkjet printer. The difference is the ink, the hardware, and what is being printed on. Instead of paper, you load a garment onto a flat platen that holds it in place during the print. The print head moves across the surface and deposits ink into the fibers of the fabric, building up the design in precise, full-color detail.
Water-based ink bonds to natural fibers. Cotton absorbs it the way paper absorbs standard inkjet ink. That molecular relationship is why DTG works on cotton and why it does not work reliably on polyester, which is exactly the reverse of dye sublimation. The two processes cover different materials and serve different purposes. Together, they cover our full range of production needs across the custom program.
How the Process Works
Pre-treatment. Before the garment goes anywhere near the printer, it gets pre-treated. A solution is applied to the print area and then heat pressed into the fabric. This does two things. First, it flattens the cotton fibers, creating a smoother surface for the print head to work across. Second, it prepares the fabric to bond properly with the ink, which is especially important on dark garments where a white layer of ink (underbase) is needed to make colors read accurately.
On a white or light-colored cotton shirt, pre-treatment is minimal and most of the time not necessary. On a dark garment, the printer lays down a layer of white ink first, then builds the full-color design on top of it. That underbase is what allows a bright, accurate print to show up on a navy or black shirt without the fabric color bleeding through.
Printing. Once pre-treated, the garment goes onto the platen and into the printer. The design file is loaded, the print head is aligned, and the printer runs the job. Depending on the complexity of the design and the color count, a single garment takes roughly three to five minutes to print. The result comes out wet, with the ink sitting in the fibers but not yet fully bonded.
Curing. The garment goes through a heat press or conveyor dryer. The heat drives the ink fully into the fabric and locks it in place. Without proper curing, the print will not hold through washing. With it, a well-executed DTG print is durable, wash-stable, and retains its color and detail over the life of the garment.
Why It Works for Custom Cotton Unit Apparel
Screen printing has been the standard for custom cotton apparel for decades, and it still makes sense at high volume with simple, limited-color designs. The economics work when you are running hundreds of identical shirts with one or two colors. But for custom unit apparel, the math shifts quickly.
Unit designs are detailed. Full-color insignia, department seals, call signs, multiple text elements: these are not two-color jobs. With screen printing, every additional color requires an additional screen, additional setup, and additional cost. The unit ordering ten shirts with a six-color design on cotton is not well served by screen printing.
DTG has no per-color cost. A two-color design and a twelve-color design cost the same to run. There are no screens to make and no setup fees tied to color count. The full design comes through at once, directly from the digital file. That makes it the practical choice for small-run, high-detail custom cotton work.
It also means the process is honest about what it does. There is no minimum order threshold that forces a unit to over-order to make the math work. One shirt or fifty, the process is the same. For unit leaders who want a small run of cotton pieces to complement a larger performance apparel order, DTG handles that without compromise.
What Makes It American Made
The "Made Here" part of this series is not just a slogan. DTG production in the United States is harder and more expensive than it sounds. The equipment is significant capital. The pre-treatment chemistry, the ink quality, the curing process, the handling of individual garments through each stage: all of it requires trained operators working carefully on each piece. Offshore production achieves lower costs partly by scaling past the point where individual attention is possible.
We do this work here because the units we serve deserve a product that was handled with the same level of care they bring to their own work. That standard does not get outsourced.
Every unit is different, and so is every order. If your team is looking for custom apparel, we have production options across performance and cotton to fit the job. Visit our Get Started page to see how the process works.