How to read a jacket or coat label: shell, lining and fill explained
A t-shirt is one fabric. A winter coat is three or four, each doing a different job, and a single label has to describe them all. That is why jacket labels list a shell, a lining and a fill separately, and why a flat read of one percentage tells you almost nothing. Here is how to read every layer, and which one actually matters for what.
Why a coat label has several compositions
Under US labelling rules (16 CFR 303) and the EU textile regulation (1007/2011), a garment made of distinct parts must disclose the fibre content of each major component. So a coat label reads something like Shell: 100 percent polyester, Lining: 100 percent polyester, Filling: 90 percent down 10 percent feather. Each line is a different layer with a different purpose, and you judge each on its own terms rather than averaging them into one number.
The shell: built to face the weather
The outer shell takes the wind, rain and abrasion, so a synthetic like polyester or nylon here is the right material, not a red flag. It is often treated with a durable water repellent (DWR) finish, historically PFAS-based, so label words like water-repellent, water-resistant or DWR signal a possible PFAS finish. Because the shell faces out and does not sit against your skin, that finish is a lower direct-contact concern than the same chemistry would be on a base layer, though PFAS-free and bluesign-marked shells are the cleaner choice.
The lining: the layer that touches you
The lining is the only layer in constant skin contact, so for skin health it is the one that matters most. A smooth synthetic lining is normal and usually fine, but if you have reactive or eczema-prone skin this is where dyes and finishes reach you, so a certified or natural lining is gentler. This is the layer to weight when you judge a coat for comfort and skin, not the shell.
The fill: where the warmth lives
Insulation traps air, and that trapped air, not the fabric, is what keeps you warm. Two families dominate. Down (duck or goose) is rated by fill power, the loft of one ounce in cubic inches: 550 is decent, 700 is good, 800 and above is premium, and higher fill power means more warmth for less weight. Synthetic fill (often polyester) is heavier for the same warmth but keeps insulating when wet and costs less. On the worry that down triggers allergies: the reaction is usually to dust and mites in poorly cleaned or aged down, not the down itself, so look for a cleanliness or Responsible Down Standard (RDS) mark, and choose synthetic fill if you have a confirmed down allergy.
The membrane: the hidden waterproof layer
A true rain shell often has a laminated waterproof-breathable membrane bonded inside, the layer that makes it actually waterproof rather than just water-repellent. It rarely shows in the fibre percentages, but it has one big consequence: a laminate of bonded different materials is very hard to recycle, because sorting cannot separate the layers. So a high-performance waterproof shell usually scores lower on recyclability than a single-fibre coat, a real and honest trade-off.
Which layer matters for what
Read a coat by purpose, not by one number. For warmth, look at the fill type and, for down, the fill power. For wet weather, look at the shell and whether it is treated or membrane-backed. For skin comfort and health, look at the lining, the layer against you. For end-of-life and recyclability, a single-fibre coat beats a laminated multi-material one. ClothTrace reads each layer separately, grades the skin-contact layer for health and the whole construction for sustainability, and never collapses a coat into one misleading score.
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Frequently asked
What do shell, lining and filling mean on a jacket label?
The shell is the outer fabric that faces the weather, the lining is the inner fabric that touches your skin, and the filling is the insulation in between that traps air for warmth. Each is listed separately because each does a different job.
Is polyester or nylon bad in a jacket shell?
No. A synthetic shell is the correct material for facing wind, rain and abrasion. Synthetics are a skin concern mainly when they sit against the skin as a base layer, not as an outer shell. Watch instead for water-repellent finishes, which can be PFAS-based.
What is fill power in a down jacket?
Fill power is the loft of one ounce of down measured in cubic inches. Higher fill power (700, 800, 900) means more warmth for less weight. It measures down quality, not how much down is in the coat.
Does down cause allergies?
Usually the reaction is to dust and dust mites in poorly cleaned or old down, not the down protein itself. Well-cleaned, certified down (look for an RDS or cleanliness mark) is low-risk. If you have a confirmed down allergy, choose synthetic fill.
- Sources
- US 16 CFR 303 (Textile Fiber Products Identification Act); EU Regulation 1007/2011 on textile fibre names and labelling.
- Fill power and down cleanliness standards; Responsible Down Standard (Textile Exchange).
- California AB 1817 and EU PFAS restriction (durable water repellent finishes); ClothTrace layer-aware grading.