High-density is a thick ink applied in layers that gives a hard raised relief with sharp edges and a smooth surface, like a rubber stamp. Puff, by contrast, expands under heat, has rounded edges and a slightly porous texture.
High-density suits geometric logos and large lettering on stable, compact fabrics such as hoodies and heavyweight tees. It is not recommended on very stretchy or thin knits, because the thick layer does not follow the stretch and may crack or lift. Washing at 30–40 °C inside out extends the life of the print.
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