To grade heat damage from a dryer on synthetic clothing, sort it into three types: surface glazing (cosmetic, usually Very Good to Good), shrink edges and puckering (structural, usually Good to Fair), and melted or fused fibers (permanent, usually Fair to Poor). Check by touch and raking light, then disclose the defect in one plain line.
Here is the return we keep seeing. A seller lists a black polyester athletic jacket as Excellent. It arrives with a shiny, stiff patch along the hem where it sat against a hot dryer drum. The buyer opens a not-as-described case, and the seller refunds the full price plus return shipping. The jacket was clean and the zipper ran fine. The seller simply never looked at the surface under angled light.
Polyester and nylon are thermoplastics. They soften under heat and do not fully recover. That is why dryer damage on synthetics is permanent in a way that a stain or a loose button is not. Below is how we sort it, test it, and write it up.
Why Synthetics Show Dryer Damage Differently
Cotton scorches or browns. Wool felts. Polyester and nylon do something else: the fibers soften, flatten, and fuse. Spandex and elastane blends also lose recovery, which shows up as a wavy or tight edge.
Three things make this defect easy to miss on a sourcing table:
- Dark colors hide glazing. Black, navy, and charcoal polyester can look fine under store lighting and show a sheen only at an angle.
- Damage clusters at stress points. Hems, cuffs, waistbands, and areas pressed against the drum or lint trap take the most heat.
- Washing does not reverse it. A garment that feels stiff after a wash is not dirty. Its fibers have changed.
In our five-factor grading, dryer heat damage touches Fabric Condition first. It can also hit Structural Integrity (shrink edges, seam puckering), Cosmetic Appearance (sheen, texture change), and Functional Elements (a melted zipper tape or a warped drawcord channel).
The Three Types of Dryer Heat Damage
Treat these as separate defects. Lumping them together as heat damage leads to either over-grading a melted hem or under-pricing a lightly glazed one.
| Type | What it looks like | What it feels like | Primary factor hit |
|---|---|---|---|
| Surface glazing | Shiny, flattened patches; sheen visible only at an angle | Slightly slick or stiff, fiber structure still intact | Cosmetic Appearance, Fabric Condition |
| Shrink edge | Wavy or puckered hem, cuff, or seam; one panel shorter than its pair | Fabric pulls or draws along the edge | Structural Integrity |
| Melt mark | Hard, glassy, or beaded spots; pinholes; fused pleats or fibers | Crunchy or rough, does not flex | Fabric Condition, Structural Integrity |
Glazing is the mild case
Glazing is flattening, not melting. The fibers are pressed smooth and reflect light differently. On a polyester fleece or a brushed activewear piece, it reads as a matted patch. On a smooth shell, it reads as a shiny band.
Melt marks are the severe case
If the fibers have fused into a hard spot, you cannot soften them back. A melt mark that penetrates the fabric or leaves a pinhole is a hole in progress, because a hardened edge tears under stress.
The Six-Step Dryer Damage Check
Run this on every polyester, nylon, or poly-blend piece you suspect has been dried hot. It takes under two minutes per garment.
- Check the care label first. Note whether it says tumble dry low or do not tumble dry. A garment labeled low heat that shows damage tells you the heat was misused.
- Rake light across the surface. Hold the garment flat and shine a phone flashlight at a low angle, almost parallel to the fabric. Glazing shows as shiny, flattened patches against the surrounding texture.
- Run your fingertips over hems, cuffs, and waistbands. Feel for stiffness, crunch, or a slick patch. Compare to an untouched area like the inside of the back panel.
- Lay it flat and compare paired parts. Left and right sleeves, both side seams, and front versus back hem lengths should match. A difference of more than about half an inch on a pair points to a shrink edge.
- Look for waviness and puckering along seams. Gently stretch a seam and let go. Fabric that rebounds flat is fine. Fabric that stays rippled has lost its shape.
- Flex any suspect spot. Bend it between your fingers. Glazed fabric still flexes. A fused spot stays rigid or crackles, and that goes straight to the lower tiers.
Photograph every defect you find under the same raking light. A close-up with a coin or ruler for scale is the evidence that backs your grade.
Where Each Defect Lands on the Grade Scale
These placements assume the rest of the garment is clean and sound. Adjust if other defects stack on top. For the full tier definitions, see our condition vocabulary guides.
- Faint glazing, visible only under raking light, no texture change: typically Very Good. Cosmetic Appearance takes a small hit, Fabric Condition stays intact.
- Clear glazing in a visible area, still flexible: typically Good. A buyer will notice it in hand, so it cannot sit in Excellent.
- Shrink edge that affects drape or fit: typically Good to Fair, depending on how far the hem or seam has pulled and whether the garment still hangs correctly.
- Melt mark, fused patch, or pinhole: typically Fair to Poor. Fabric Condition and Structural Integrity both drop, and the damage can spread under wear.
- Melted zipper tape, warped drawcord channel, or deformed snaps: grade the Functional Elements separately. If the closure fails, the garment falls to Fair or Poor regardless of how the fabric looks.
Heat damage should never sit in Excellent. NWT and NWOT are out of the question once the fibers have changed, since the garment is no longer in its original state.
Telling Dryer Damage From Normal Wear
Not every sheen is heat. Two lookalikes cause wrong calls.
Friction shine. Seat areas on nylon pants and elbow zones on shells go shiny from rubbing. Friction shine is located where the body contacts surfaces. Dryer glazing tends to follow the hem, the folds, or the fabric that pressed against the drum. If the shine is in a wear zone only, grade it as wear.
Finish loss. A durable water repellent coating or a calendered finish can wear off and leave uneven sheen. Check whether the fabric texture itself changed. If the weave is still crisp and the fiber still moves, it is finish, not fused fibers.
When you cannot tell, press the area between two fingers and compare it to a protected spot. Heat damage changes the hand of the fabric. Finish loss usually does not.
The Disclosure Line for Each Type
One plain sentence per defect. Name the location, name the defect, and say what it does or does not affect. Place it in the description and in the item specifics notes where the marketplace allows it.
- Glazing: "Light glazing (flattened, slightly shiny fabric) along the left hem, visible at an angle. Fabric is flexible and intact."
- Shrink edge: "Hem has shrunk slightly from dryer heat and sits wavy, about half an inch shorter on the right side. Fit is otherwise true to size."
- Melt mark: "One small melted spot (about the size of a dime) on the lower back panel from dryer heat. Fabric is hard at that spot. See photo 6."
Do not write "minor wear" or "gently used" next to any of these. Marketplaces like eBay and Poshmark measure not-as-described claims against what the buyer sees in photos, and a vague adjective gives them nothing to point to. A specific defect note with a matching photo does.
Should You List It, Discount It, or Skip It?
The call depends on the tier and the price of the piece.
- Very Good or Good with glazing: list it, price it by the grade, and show the glazed area. Many buyers accept cosmetic sheen on activewear.
- Fair with a shrink edge: list only if the margin holds after a real discount, or bundle it. Offers on Poshmark will target the defect.
- Poor with melt marks: usually skip, unless the piece is a rare brand where a buyer wants it for parts or reference.
Never promise a sale, and do not assume a buyer will overlook the defect. Plan for the full refund scenario when you price a Fair item.
Grade One Garment and See the Report
If you have a polyester or nylon piece you are unsure about, grade it with GradeThread. You get a numerical grade on the 1.0 to 10.0 scale, a condition report across all five factors, and a certificate buyers can verify. It is a low-stakes way to see how glazing or a shrink edge changes the numbers before you write the listing.