How to Prepare an Activewear Tech Pack That Manufacturers Actually Use

If you are a B2B brand or designer planning to outsource activewear production, the first document your manufacturer will request is a tech pack. This is the single source of truth that defines every detail of your garment before sampling and bulk production begin. A well-structured activewear tech pack eliminates guesswork, reduces sampling rounds, and helps both OEM and ODM projects stay on schedule and on budget. At Junhao Sportswear, we process hundreds of tech packs yearly, and the difference between a clear specification and a vague one often determines how quickly your activewear line reaches the market.

What Exactly Is an Activewear Tech Pack?

A tech pack is a technical specification document that translates your design idea into factory-ready instructions. Unlike a fashion illustration or mood board, a tech pack includes precise measurements, material references, construction details, and acceptable tolerances. For activewear—where performance fabrics, stretch, and functional seaming are critical—a generic tech pack rarely works. The document must address specific requirements like recovery rate, moisture-wicking properties, seam strength, and intended end-use (yoga, running, gym, etc.). In our factory, we treat the tech pack as a binding production reference; any point not clearly defined in the document becomes an open variable, which can lead to misinterpretation.

Key Sections Every Activewear Tech Pack Must Include

Based on our experience working with start-up brands, sports labels, and B2B distributors, the following sections are non-negotiable for smooth activewear production.

1. Technical Flat Sketch (Front & Back)

Include a clean, black-and-white vector sketch showing front and back views. Use callouts to highlight design features: pocket placement, zipper length, seam lines, elastic width, and hem finish. If your design has a specific waistband construction or reflective trim, indicate it here. Avoid shading or artistic rendering; manufacturers need technical clarity, not fashion illustration.

2. Bill of Materials (BOM)

The BOM lists every component needed to produce the garment. For activewear, break it down by:

• Main fabric: nylon-spandex blend, polyester, recycled poly, etc. Include weight, composition, and any finishing (e.g., wicking, anti-odor, UV protection).
• Lining: mesh, power mesh, or inner brief liner. Specify color and stretch direction.
• Trims: zippers (YKK or equivalent), drawcords, toggles, elastic, labels, and thread color. If your brand uses custom pullers or heat-transfer logos, attach reference images and size specs.

3. Size Chart & Measurement Points

Provide a measurement chart covering your full size range (e.g., XS–2XL). Define how each point is measured: waist stretched and relaxed, inseam length, front rise, hip width, etc. At Junhao Sportswear, we strongly recommend clients reference an international standard (ASTM, EN, or ISO) to avoid confusion. If you want a specific fit—compression, relaxed, or sculpting—state this in the measurement section and note the acceptable tolerance (+/- 0.5 cm or as agreed).

4. Construction & Stitching Details

Activewear often involves flatlock seams, overlock, coverstitch, and twin-needle finishing. Specify seam types for each area: a flatlock seam on side seams for a gym tee, a coverstitch hem on a yoga pant, or a bonded seam on a waterproof jacket. Include stitch density (SPI – stitches per inch) and thread type. This section also covers seam reinforcement at stress points and gusset construction details.

5. Print, Logo & Label Placement

Provide artwork files (AI or PDF) for screen prints, sublimation panels, or heat-transfer logos. Indicate exact placement measured from key reference points like neckline or side seam. Specify print technique, dimensions, and color references (Pantone codes). For care labels and brand labels, include precise sewing position and material. Without this, your branding may end up in a different spot on the left arm versus the right chest.

Common Tech Pack Mistakes That Delay Activewear Production

Over the years, we have observed recurring issues that cause sampling errors and timeline delays. Inconsistent measurement definitions are the most frequent problem—one brand’s “chest width” might be measured 2.5 cm below armhole, while another uses the armpit point. Missing fabric weight details often lead to a completely different hand feel. Another typical gap is the absence of stretch or recovery requirements; for leggings and sports bras, this is critical. Finally, color references without Pantone or lab-dip confirmation create visual mismatches between approval and bulk. Addressing these points in your initial tech pack saves at least one sampling round.

How Junhao Sportswear Reviews and Uses Your Tech Pack

When we receive a tech pack, our pattern-making team first validates the measurements and checks fabric consistency against the BOM. If any information is missing—say, seam type or zipper reference—we immediately raise a clarification request. This proactive review ensures your prototype is cut correctly from day one. For ODM clients who provide only a reference sample, we reverse-engineer a tech pack for client approval, but this requires additional sampling lead time. Therefore, we always encourage buyers to prepare their own detailed tech pack to maintain design control and reduce development cost.

Activewear Tech Pack Checklist (Free Reference)

Use this checklist before sending your file to any activewear manufacturer. Each item must be clearly defined.

• Front and back flat sketch with feature callouts
• Main fabric composition, weight, and finish
• Lining/ mesh type and color
• Stretch direction and recovery expectation
• Seam types per join (flatlock, overlock, coverstitch)
• Thread color and SPI specification
• Zipper, drawcord, elastic, and toggle details
• Size chart with measurement points method
• Tolerance for key measurements
• Print/logo placement and dimensions
• Label and hang tag placement
• Pantone or lab-dip color references
• Packaging and folding instruction (if needed)

FAQ About Activewear Tech Packs

What is a tech pack in activewear manufacturing?

A tech pack is a detailed specification document that communicates every technical detail of your activewear design to the factory. It includes technical sketches, material descriptions, size charts, stitching details, and quality requirements. A well-prepared tech pack reduces sampling delays, ensures accurate production, and avoids costly misinterpretation between brands and manufacturers.

What information must be included in an activewear tech pack?

A complete activewear tech pack must include technical flat sketches with callouts, a bill of materials (BOM) specifying main fabric, lining, and trims, a size chart with key measurements, construction and stitching details, color codes, print or logo placement specifications, and quality control references. Missing details often cause sampling errors and production delays.

Can a manufacturer help create a tech pack if I only have a sample or idea?

Many activewear manufacturers, especially those offering ODM or OEM services, can support tech pack creation from a physical sample or design concept. However, the clearer your initial specification, the faster and more accurate the development. Basic sketches, fabric references, and target fit standards help the manufacturer’s pattern team translate your idea correctly.

Ready to move your activewear design into production? Send us your tech pack or design brief at https://junhaosportswear.com/contact/. Our team will review your specifications within 24 hours and provide a sampling timeline and cost estimate tailored to your project. For brands still developing their first activewear line, we also offer ODM support— just share your reference images and target market, and we’ll help structure your tech pack for manufacturing success.