A hoodie tech pack should record GSM as part of an identified fabric specification, not as a lone number beside a generic word such as fleece. Include the fabric code, construction, composition basis, finish, delivered state, units, agreed range, and approved reference. State which component the density describes: body, hood lining, rib, or another material. Keep the relevant assessment basis clear so production and reorder samples can be compared meaningfully. The purpose of this page is documentation and reproducibility. It does not replace density measurement, tolerance negotiation, or complete garment approval, but it preserves the decisions those stages have already established.
Put the number in the material section
GSM measures fabric mass per area. It does not describe the total hoodie mass or a universal quality level. A tech pack should therefore place it within the bill of materials or material specification, attached to a particular component. If the body uses one fleece and the hood uses another lining, they need separate identities. A single “350 GSM hoodie” note can leave the factory uncertain whether the value applies to every textile, the body only, or a marketing description. Write the component relationship explicitly instead of expecting each reviewer to infer it.
The GSM guide explains the underlying quantity. Within a tech pack, the practical job is to preserve its basis. Use g/m² or GSM consistently, and spell out oz/yd² if that unit is also shown. Do not add an unexplained “oz” value that can be confused with garment ounces. If both systems appear, make them equivalent through a documented conversion and sensible rounding. A converted value should not create a second conflicting target or a tighter-looking specification through unnecessary decimals.
Identify the construction behind the target
Record the selected knit structure and relevant face or reverse characteristics. Brushed fleece and loopback can share a density target while creating different interiors and drape. Whole-fabric composition can also conceal different face and backing yarn systems. The blend fabric guide explains that broader material context; a tech pack should retain the selected arrangement where it matters. A note such as “cotton-rich fleece” is not enough when the approved product depends on a particular face, reverse texture, or finishing state.
The fabric code should connect to a supplier or development reference clearly enough to distinguish variants. A family name can contain different weights, colors, and finish options. Include the variant that was approved, and describe the important characteristics rather than relying solely on a sales nickname. This is particularly valuable for reorders when another person handles purchasing. The new reviewer should understand why a similar-looking material is or is not an acceptable substitute. A controlled identity protects the product character that the density number alone cannot capture.
Specify the material state
State whether the density target concerns delivered finished fabric, a pre-finish development state, or another defined stage. If the product undergoes a garment wash, distinguish the input fabric specification from any approved post-process observation. These may describe different material states and should not be merged into one ambiguous figure. A reorder can otherwise be judged against a cared-for prototype while the factory is quoting unprocessed roll material. Clear state information prevents that comparison from being mistaken for a supplier error or an unexplained weight change.
Relevant finish descriptors can include brushed or unbrushed reverse, selected wash treatment, and treatments important to hand or decoration compatibility. Keep the description at the level needed to reproduce the approved material; this article does not require publishing a proprietary mill recipe. If a finish is changed during development, update the material record that accompanies the selected sample. A tech pack should describe the final approved product rather than retain an earlier state because its number is familiar. The written specification and physical reference must refer to the same decision.
Preserve the agreed acceptance range
Record the target and agreed lower and upper limits, or another unambiguous tolerance expression. Those values should come from the purchasing and technical agreement, not from a generic tech pack template. If the range is asymmetric, write both limits explicitly. If acceptance uses a percentage, make clear which target it applies to. This page does not recommend a universal tolerance. Its purpose is to prevent a previously resolved agreement from disappearing into an approximate statement such as “about 350 GSM,” which gives later reviewers no consistent basis for a decision.
The assessment and sampling basis should be referenced clearly enough that the production team can locate it. A tech pack does not need to reproduce an entire laboratory standard, but it should not claim compliance merely because a method title has been copied into a field. Identify the responsible procedure and relevant material state from the actual agreement. Where a boundary decision rule has been established, retain it in the appropriate quality documentation. The density field and its referenced acceptance document should agree rather than describing conflicting conditions.
Separate body, rib, lining, and local layers
Different components can use different textile structures. A body-density specification does not establish the rib's stretch recovery or the hood lining's bulk. A double-layer hood does not mean that its body fabric has twice the stated GSM; the assembly contains two material layers. Record each material and its placement. If the design uses the body fabric again inside the hood, state that relationship. If it uses a separate lining, identify it separately. This prevents a density note from silently dictating the entire garment construction.
For example, an illustrative tech pack can specify an identified loopback body, a matching body-fabric inner hood, and a separately identified rib for cuffs and waistband. The density target belongs to each relevant textile record, while the construction page shows the double-layer hood. The example does not recommend specific values. It demonstrates how material specification and assembly description work together. A reviewer should be able to see what fabric is used and how many layers the design creates without interpreting one number as both material density and finished stack thickness.
Link the specification to an approved reference
Name the approved swatch or material reference and the complete sample version that used it. A physical reference can preserve hand, texture, and appearance that are difficult to capture numerically. Photographs can support identification but should not be treated as a precise substitute for tactile or color comparison. Through hoodie material specification, connect the density field to the selected construction and finish. That connection explains what the production team is expected to reproduce beyond the numeric target.
Decoration approval may also depend on the exact face, color, and finish. If the fabric record changes, assess whether the earlier decorated sample still applies. Do not assume that a new material inside the same GSM range inherits all previous compatibility evidence. The tech pack should distinguish approved material from an alternative awaiting assessment. A proposed substitute can be a useful development option, but it should not be labeled approved until the relevant product requirements have been reviewed. Clear status makes the file useful without pretending every candidate is production-ready.
Maintain one current source of truth
When a material target changes, update the final specification and its related references consistently. A cover-page summary, bill of materials, and quality note should not each carry a different density. Retain revision information sufficient to distinguish the selected state from obsolete development options. This is not paperwork for its own sake: conflicting numbers can lead a supplier to produce the wrong material even when each person believes they followed the file. The goal is a readable final record that points to one approved construction and acceptance basis.
For custom hoodie production and reorders, use the tech pack to preserve the decisions already supported by samples and assessments. Record density with identity, component, finish, state, units, range, and approval reference. Keep measurement instructions and tolerance decisions in their appropriate supporting documents rather than inventing them in the material field. A well-written GSM specification lets the next order be compared on the same basis. It cannot replace a representative product review, but it makes that review technically coherent and reproducible.
Share your approved hoodie material details to develop a clear fabric specification for sampling and production.
