Sleep sack TOG development begins with the complete layer system. The shell, lining, filling, quilting, openings and construction determine what needs to be developed and verified. Define the intended product and wearer, then choose a candidate material assembly and a suitable validation plan.
Jinshi can discuss 0.5, 1.0, 2.5 and 3.5 TOG as candidate development targets. They are not published test results for every fabric or style. A target is accepted for a particular project only after reviewing its construction, intended use, market requirements and verification route.
Tell us whether you need a cot sleep bag, a sleep sack with legs or a different wearable product. Specify the wearer's size, weight guidance where relevant, developmental stage and intended setting. Include whether there are sleeves, removable components, fold-over features or an adjustable opening.
These details affect both fit and the standards that may apply. A standard written for cot sleep bags has a defined scope; it should not be applied automatically to outdoor bags, travel products or every walking style. The BSI scope overview for children's cot sleep bags illustrates why product use and developmental capability belong in the brief.
| Part of the product | Information to specify | Question to resolve in development |
|---|---|---|
| Outer shell | Fiber blend, construction, weight, finish and print version | Does the selected finish and print suit the finished assembly? |
| Inner layer | Fiber blend, construction, weight and skin-contact surface | Does it remain compatible with the shell after care? |
| Filling, if used | Material, weight, distribution and attachment | Does it remain distributed as intended through use and washing? |
| Seams and quilting | Layout, attachment method and seam construction | Do these create different thickness or local compression? |
| Closures and openings | Zipper, guard, neck/arm openings and adjustment details | Does the finished size maintain the intended fit and access? |
| Detachable features | Permitted configurations and attachment method | Does each marketed configuration need separate assessment? |
A two-layer bag and a filled bag require different specifications even if their outer fabrics look the same. Keep a drawing of the complete assembly alongside the material list.
TOG describes thermal resistance. Fabric GSM describes mass per unit area. There is no universal conversion from GSM to a finished sleep sack's TOG value, and adding the weights of the layers does not create a verified rating.
The ISO thermal resistance method overview covers textile materials and multilayer assemblies under defined conditions. Its scope also explains that those conditions do not represent every comfort situation. The laboratory and market review must establish the appropriate method, edition, specimen configuration, preparation and report wording for your product.
Record whether a result applies to an assembly specimen or a completed product, how the specimen represents the garment, and which size and configuration were evaluated. A report should identify the actual materials and construction sufficiently to connect it to production.
An early trial might compare an unfilled shell-and-lining construction with one or more filled versions. Use the trial to evaluate handle, drape, overall bulk, wash behavior and thermal performance together.
| Candidate brief | Development question |
|---|---|
| 0.5 or 1.0 TOG target | Which appropriate material assembly can reach the selected lower target with acceptable fit and care behavior? |
| 2.5 TOG target | How should filling, quilting and layers be balanced for the intended product? |
| 3.5 TOG target | Is this target suitable for the chosen construction and applicable product standard, including sleeve configuration? |
These are development questions, not a room-temperature chart. Do not assign one universal temperature range, clothing combination or suitability statement to all products carrying the same number.
Review the neck and arm openings, closures, attachment strength, loose elements, seam integrity, access to filling and fit after the intended care process. Identify the checks required by the product's destination market and applicable standard, then add the brand's agreed durability criteria.
Approve the material assembly, size specification, artwork, labels and permitted configurations together. A later change to filling, shell, lining, quilting or sleeve construction needs an assessment of which results and claims remain applicable. The same review applies when a development trial becomes a repeat order.
The buyer's product information should describe how to choose the correct size, fit the approved design, use its closures and care for it. Thermal guidance must relate to the validated product and be reviewed for the intended market.
For infant sleep imagery and instructions, follow current public-health guidance. NIH Safe to Sleep advises avoiding overheating and weighted sleep products, keeping the head and face uncovered and using a clear, firm, flat sleep surface. A sleep sack should not be advertised as preventing SIDS or guaranteeing better sleep.
Include the product drawing, market, sizes, wearer/use description, sleeve configuration, candidate TOG target, preferred fibers, care direction and planned claims. A reference product can help explain the intended hand feel, but its rating does not transfer to a new construction.
