Product specifications
Last updated: November 2026
Product specifications are the written, measurable requirements that define what a product is and exactly how it must be made.
In this Spec to Shelf guide, product strategist Cydney Mar explains what product specifications include, the three common types, real product specifications examples, and how to write a product specifications sheet that lets any supplier quote the same product and lets you check every sample against one standard.
Product specifications are a product's rulebook. They state dimensions, materials, components, performance targets, finishes, labeling and packaging in numbers and plain words, so a manufacturer does not have to guess and you can reject anything that does not match.
Definition
A product specification is a dated, versioned document listing every measurable requirement a product must meet, from raw materials to the carton it ships in. It is owned by the brand, sent identically to every supplier asked to quote, and updated after each sample. For garments the same document is called a tech pack; for most other consumer products it is a product specification sheet.
Manufacturer specifications
Manufacturer specifications are the requirements a factory works to: its own standard specs for a stock item, or the specs a brand supplies for a custom product. When you rely on the factory's specs, the product is defined by them. When you write your own, the product stays the same wherever it is made.
A common way to group them is functional, performance and design specifications. Most consumer product specification sheets combine all three.
What the product must do. A travel mug must keep liquid inside when closed and fit a car cup holder.
Measurable targets it must hit, such as burn time for a candle or wash durability for a printed tee.
Exactly how it is built: materials, dimensions, tolerances, construction, color references and finish.
Here are product specifications examples for three consumer products, judged on the same five lines so you can see how the pattern repeats across categories.
| Spec line | Scented candle | Bath bomb | Tote bag |
|---|---|---|---|
| Materials | Wax type, wick type, vessel material | Ingredient list by weight | Body fabric, lining, handle material |
| Dimensions | Vessel height and diameter, fill weight | Diameter and finished weight | Width, height, gusset, handle drop |
| Performance | Burn time target, fragrance load | Fizz and color release expectations | Load the handles must carry |
| Finish and branding | Label size and placement | Mold detail, wrap or shrink film | Print method and logo placement |
| Packaging | Lid, box, carton pack count | Individual wrap, display box | Fold, polybag, carton count |
Write it in this order, and keep the same order for every product in your line.
Missing details become supplier defaults, and defaults become rework. The best published figure comes from garments, where Techpacker reports the cost per style, per sampling round.
Software product specifications describe features, user flows and system behavior, and they change often. Physical product specifications describe materials and measurements, and once production starts, changes cost real money. This site covers physical consumer products only.
Product specifications are the written, measurable requirements that define what a product is and how it must be made. They cover dimensions, materials, components, performance, finishes, labeling and packaging. A good specification lets different suppliers quote the same product and lets you check every sample and production unit against the same standard.
More in the FAQHere is an example of product specifications for a scented candle: vessel material and dimensions, wax type and fill weight, wick type and count, fragrance load as a percentage, a burn time target, label size and placement, and carton pack count. Each line is measurable, so a supplier can quote it and you can check the sample against it.
More in the FAQA common way to group product specifications is into three types. Functional specifications describe what the product must do. Performance specifications set measurable targets such as durability or burn time. Design specifications describe exactly how it is built, including materials, dimensions and construction. Most consumer products need all three in one document.
More in the FAQThe 5 C's of specification writing are often listed as clear, concise, correct, complete and consistent. In practice that means one meaning per line, no extra words, accurate numbers, nothing the supplier has to guess, and the same units and terms used throughout the document. Lists vary slightly by source, but these five are the most commonly cited.
More in the FAQWrite a product specification sheet by naming the product and version, listing every material and component, stating dimensions with tolerances, adding performance targets, describing finishes, labeling and packaging, and keeping a dated revision log. Use one unit system throughout, and add drawings or photos wherever words could be misread.
More in the FAQSpecifications usually look like a structured document or spreadsheet: a header with product name, version and date, then tables of materials, dimensions, tolerances and performance targets, plus drawings, photos and notes. For garments, the same idea takes the form of a tech pack, organized style by style.
More in the FAQThe word specifications means a detailed, exact statement of requirements. In product development, specifications are the precise details a product must meet, such as size, material, weight and finish, written so that anyone making or checking the product reaches the same result.
More in the FAQManufacturer specifications are the requirements a manufacturer works to: either their own standard specs for a stock product, or the specs a brand supplies for a custom product. For a new consumer product, the brand should own its specification, so the product stays the same if production ever moves to another factory.
More in the FAQSee all questions in the tech pack and product development FAQ
Cydney Mar guides founders of consumer products for retail, TV and direct-to-consumer through the Concept-to-Reality Pathway, from product clarity to launch.
Published by Cydney Mar
