How DTG Printing Works: A Practical Guide for Custom Sportswear Buyers

When you’re sourcing custom apparel—whether for a gym’s new tank tops, a streetwear brand’s limited-run hoodies, or a sports team’s practice jerseys—the printing method you choose fundamentally impacts your cost, design flexibility, and the final product’s feel and durability. Direct-to-Garment (DTG) printing has become a cornerstone of modern custom sportswear manufacturing, especially for brands prioritizing detailed artwork, small batches, and a soft hand feel. Understanding how DTG printing works is essential for making informed sourcing decisions, communicating effectively with your factory, and setting realistic expectations for your custom project.

This guide moves beyond a simple definition. We’ll break down the DTG process from a manufacturer’s perspective, highlight its unique advantages and limitations for activewear, and provide a practical framework for evaluating if it’s the right fit for your specific order. By the end, you’ll know exactly what information to provide your OEM/ODM partner to get the best results and avoid costly revisions.

The DTG Process: Step-by-Step from File to Finished Garment

DTG printing is a digital inkjet technology that prints full-color images directly onto fabric, much like a high-resolution desktop printer applies ink to paper. However, the machinery, inks, and fabric preparation are industrial-grade and designed for textile substrates. The process is largely automated, which contributes to its consistency for repeat orders.

More advice: The Oversized Cotton Hoodie: Style Guide & Custom Manufacturing Insights

1. Artwork Preparation and Prepress

Your design file (typically a high-resolution PNG or PSD with a transparent background) is the starting point. A skilled pre-press technician uses specialized RIP (Raster Image Processor) software to adjust the image for the specific garment. This step is critical and involves:

Color profiling: Calibrating the digital file to match the exact ink set (CMYK + White) of the DTG printer to ensure color accuracy.
Underbase generation: For dark garments, the software automatically creates a white ink “underbase” layer. This opaque primer layer sits beneath the colored inks to make them vibrant and prevent the garment’s color from showing through.
Sizing and placement: The design is mapped precisely to the garment’s printable area, accounting for seams, tags, and curves.

2. Garment Preparation and Pretreatment

This is the most hands-on and technically crucial step for quality. The garment is loaded onto a specialized platen that holds it flat and taut. Before printing, the fabric area receives a pretreatment spray.

The pretreatment is a liquid polymer solution. Its job is to:

Seal the fabric fibers temporarily.
Create a receptive surface for the water-based DTG inks to bond to.
Prevent ink from wicking (spreading) into the fabric, which would blur details.

The formulation of the pretreatment is not one-size-fits-all. It varies significantly based on the fabric composition (100% cotton vs. cotton/polyester blends vs. 100% polyester) and the garment’s color. A factory using DTG for sportswear must have a robust pretreatment protocol and testing procedure for each fabric type they source. Poor or skipped pretreatment is the leading cause of print failure—cracking, fading, or poor hand feel.

3. The Printing Pass

The pretreated garment, now on the platen, is fed into the DTG printer (like a Epson SureColor F series or a Brother GTX). The print heads pass over the garment, jetting microscopic droplets of CMYK and, when needed, white ink. The printer builds the image in layers: first the white underbase (if required), then the full-color layers on top. For complex designs with gradients, photos, or hundreds of colors, this is where DTG shines—there is no manual color separation or screen setup.

4. Curing

The freshly printed garment is immediately moved to a conveyor dryer or a heat press. The curing process uses high heat (typically 320-350°F / 160-175°C) for a precise duration (usually 60-90 seconds) to permanently bond the ink to the fabric fibers. Incomplete curing leads to poor wash fastness, while excessive heat can scorch the pretreatment or damage the garment. This step requires calibrated equipment and operator expertise.

Why DTG is a Game-Changer for Custom Sportswear

For your sourcing strategy, DTG’s value proposition is distinct from traditional screen printing or embroidery. Here’s why it’s often the preferred method for activewear brands and teams.

No Minimum Order Quantities (MOQs) for Designs: The “digital” nature means there’s no cost to change designs or colors between garments. This makes DTG economically viable for orders as small as a single piece, perfect for prototypes, e-commerce samples, or small team orders.
Unlimited Color Palette & Detail: Print full-color photographs, intricate gradients, and tiny text with ease. There are no additional charges for extra colors, which is a major constraint in screen printing.
Soft Hand Feel: Because the ink is jetted directly and bonded to fibers (rather than sitting on top like plastisol screen printing), the result is a much softer, more breathable print—a critical factor for performance apparel worn during activity.
Ideal for All-Over and Panel Printing: DTG can print seamlessly across seams and on garment panels before assembly (seam-to-seam printing). This is a premium feature for creating unique, cohesive designs on hoodies and jackets that screen printing can’t easily achieve.

Key Considerations and Limitations for Buyers

DTG is powerful, but it’s not a universal solution. Understanding its limitations is key to setting accurate specifications and avoiding production issues.

Factor	DTG Printing	Traditional Screen Printing	What It Means For You
Best Fabric	100% Cotton, High-Cotton Blends	Almost Any Fabric	DTG on 100% polyester is possible but challenging (requires special inks/pretreat) and may have less vibrant colors and a stiffer feel. For performance polyester athletic wear, screen printing or sublimation may be more suitable.
Garment Color	Excellent on Light, Good on Dark (with underbase)	Excellent on both	Dark garments require a white underbase, which adds a slight stiffness to the printed area and increases ink usage/cost. Very dark colors on dark fabrics can be tricky.
Order Size	1 – ~500 pieces (sweet spot)	50+ pieces (economies of scale)	DTG is cost-effective for small to medium runs. For very large volumes (>1,000 pcs), screen printing often becomes cheaper per unit.
Design Complexity	Unlimited colors, photos, gradients	Limited by number of screens (colors)	DTG is perfect for photorealistic artwork or designs with many colors. Simple, bold graphics can be done on either.
Durability	Very Good (with proper cure)	Excellent (plastisol sits on top)	DTG prints can achieve 50+ washes with proper pretreatment and curing. However, they may feel slightly stiffer after multiple washes compared to the initial soft feel.

Table: Comparing DTG to screen printing for custom sportswear sourcing.

Sourcing DTG Custom Sportswear: What to Communicate to Your Factory

A successful DTG order hinges on clear communication. When requesting quotes or placing an order, provide the following information explicitly to avoid misunderstandings and ensure the factory can produce to your quality standards.

Helpful tip: Is Satin Natural or Synthetic? A Sportswear Manufacturer’s Guide to Fabric Selection

The Essential Checklist for Your RFQ (Request for Quotation)

Garment Spec: Brand, style number, fabric composition (e.g., 100% combed cotton, 60/40 cotton/poly), and garment color (specify Pantone or color name). This is the single most important factor for DTG feasibility.
Artwork Files: Provide the highest resolution source file possible (300 DPI at actual print size). Specify if the design needs to be mirrored for printing (it usually does).
Print Placement & Size: Define the exact location (e.g., “left chest, 4″ wide”) and any special requirements like “print over seam” or “all-over panel print.”
Quantity: Total pieces and, if applicable, breakdown by size/color.
Quality Reference: If you have a sample from a previous order or a specific feel/durability expectation, share it. Ask the factory about their wash test protocols.
Ink Type Inquiry: Ask if they use water-based, eco-friendly, or other specialty inks (e.g., white ink for dark garments). For activewear, inquire about OEKO-TEX Standard 100 certification for inks if chemical safety is a concern for your market.

Red Flag: If a factory quotes DTG on 100% polyester without discussing specialized processes, ink types, or potential limitations in vibrancy, proceed with caution. Ask for a sample first.

Real-World Sourcing Scenarios: Is DTG Right For You?

Scenario 1: A boutique yoga brand wants 200 custom-printed leggings.
Leggings are typically 100% polyester/spandex. Standard DTG on this fabric will likely yield poor results—stiff, cracked prints with dull colors. The better path is to ask the factory about DTG on polyester-specific pretreatments and inks (e.g., using a poly pretreatment and inks formulated for synthetics) and insist on a physical sample on the exact fabric. Alternatively, explore sublimation if the design is all-over, as it’s the gold standard for polyester performance wear.

Scenario 2: A CrossFit gym needs 15 coaching shirts with names and logos.
This is a perfect DTG use case. 100% cotton t-shirts, small quantity, personalized text. The MOQ is zero, and the soft print is ideal for everyday athletic wear. The gym can even order a mix of shirt colors with the same design at no extra setup cost.

Scenario 3: A streetwear label is launching a 50-piece drop of graphic hoodies.
For a cotton hoodie with a complex, multi-color album-cover-style graphic, DTG is an excellent choice for quality and flexibility. The label can offer multiple hoodie colors (heather grey, black, white) with the same vibrant design. The factory should pretreat the hoodies and print on the assembled garment for a seamless look, or on panels for a cleaner seam result.

Frequently Asked Questions When Sourcing DTG

How does DTG print white ink on dark shirts?

It uses an additional white ink channel. The RIP software generates a white underbase layer that is printed first, then the CMYK colors are printed on top. This process requires more white ink and a printer that has a dedicated white ink system.

What’s the typical turnaround time for a DTG order?

It varies by factory and order size, but for a standard run of 50-100 cotton t-shirts, expect 5-10 business days after artwork approval and fabric sourcing. The pretreatment and curing steps add time compared to a simple vinyl cut, but the absence of screen setup makes it faster than screen printing for small runs.

Can DTG print on zippers, pockets, or seams?

Printing directly over thick seams, zippers, or pockets is not recommended, as the print head can be damaged and the result will be poor. For “all-over” looks on hoodies or jackets, the industry practice is to print on flat fabric panels before the garment is sewn together (seam-to-seam printing). This requires the factory to have both printing and assembly capabilities, which is common for full-package OEM/ODM providers.

How do I ensure color matching?

Provide a physical sample or a Pantone reference. Digital files on screens are not color-accurate. Reputable factories will produce a strike-off sample (a single printed piece) for your approval before running the full production batch. Always approve a sample for color and placement.