Sanforizing is a mechanical finishing process that pre-shrinks fabric by compressing it - guaranteeing residual shrinkage under 1% (often labeled 'Sanforized').
How Sanforizing Works
Fabric is fed through a sanforizing range: it's dampened, then pressed against a thick rubber blanket that compresses it lengthwise as it moves. This mechanical compression forces the yarns into their relaxed, shrunken state permanently - the fabric physically cannot shrink much further. The process is fast, continuous, and handles huge yardage.
The Sanforized Label
'Sanforized' is a licensed trademark - only fabric processed on genuine Sanfor machines under license can carry the label. It's one of the oldest and most trusted quality marks in textiles, dating back to 1930.
Sanforized vs Unwashed
Denim fans know this distinction well. Sanforized denim barely shrinks - what you buy is what you get. Unwashed (unsanforized) denim shrinks significantly on first wash, which is why raw denim enthusiasts size up. Same fabric, different finishing, completely different behavior.
FAQs
- Who invented sanforizing?
- Sanford Lockwood Cluett, 1930. The name combines 'Sanford' with '-ize'.
- Does sanforizing wear off?
- No - it's a permanent mechanical process, not a chemical coating.
- Is all pre-shrunk fabric Sanforized?
- No - Sanforized is a specific licensed process. Other methods also pre-shrink.
Glossary: see the full fashion glossary for more apparel industry terms.