A tech pack is the technical spec sheet a factory uses to make your garment correctly. It covers measurements and grading, fabric and GSM, colorways with Pantone references, trims, labeling, and packaging. Without one, a factory guesses — and you pay for the guess in sampling rounds.
The technical specification a factory needs to produce your garment: measurements, fabric, colorways, trims, labeling, and construction details.
You can get a rough quote without one, but an accurate quote — and a correct sample — needs a tech pack. It removes the guesswork factories otherwise price as risk.
They pin down exact colors so the fabric a factory dyes matches the color you designed, rather than an approximation.