# Sanforization — Boring Label Textile Glossary *Sanforization is a patented mechanical pre-shrinking process that passes fabric through a rubber blanket under heat and moisture, compressing it to reduce residual shrinkage to less than 1%.* *Boring Label · boringlabel.com · hello@boringlabel.com* --- ## Understanding the Term ### The gold standard in shrinkage control. Invented by Sanford Cluett in 1930, Sanforization feeds fabric between a heated steel cylinder and a thick rubber blanket. As the blanket compresses, the fabric is mechanically compacted in the warp (length) direction, simulating the shrinkage that would occur during washing. The process is purely mechanical — no chemicals are involved. The fabric emerges dimensionally stable, with residual shrinkage of less than 1% in the warp direction. This is significantly better than untreated fabric, which can shrink 5–8%. Sanforization is widely used for woven fabrics (denim, shirting) and can also be applied to knits. For our knitted t-shirt fabric, we use a similar compressive shrinkage process optimised for jersey construction. --- ## Why It Matters ### How Sanforization protects garment dimensions. The mechanical process that made sizing reliable. - **Sub-1% Shrinkage** — Sanforized fabric shrinks less than 1% after washing. This is the tightest tolerance in commercial textile processing. - **No Chemical Treatment** — The process is purely mechanical — compression between rollers. No resins, no formaldehyde, no chemical residue on the finished fabric. - **Universal Standard** — The 'Sanforized' label has been a consumer trust mark since the 1930s. It's one of the oldest and most respected quality certifications in textiles. --- ## Our Standard ### Compressive shrinkage at our facility. Our knitted Supima fabric undergoes compressive shrinkage treatment equivalent to Sanforization, optimised for single jersey construction. The process ensures less than 3% residual shrinkage — the tightest practical tolerance for premium knit garments. - **<3%** Residual Shrinkage — After compressive treatment at our Bhiwandi facility --- ## Sanforization — your questions, answered. Understanding mechanical pre-shrinking. **Is your fabric Sanforized?** We use an equivalent compressive shrinkage process optimised for knits. True Sanforization is designed for woven fabrics. The principle is identical — mechanical compression to reduce shrinkage. **Why 3% and not 1% like woven Sanforized fabric?** Knitted fabrics have inherent elasticity that woven fabrics don't. The 1% Sanforized standard applies to rigid wovens. For knits, less than 3% is the industry benchmark for premium. **Does the process affect softness?** The compressive treatment actually improves softness slightly by relaxing internal tensions in the fabric. It's a beneficial side effect. **How much shrinkage does sanforization prevent?** A properly sanforized fabric should shrink less than 1% in the wash, compared to 3–10% for untreated cotton. The Sanforized trademark (licensed by Sanfor Systems) guarantees under 1% shrinkage. This means a sanforized shirt bought in size M will remain size M after washing — no allowance needed for pre-shrinking. **What is the difference between sanforization and pre-shrinking?** Pre-shrinking is a general term for any process that induces shrinkage before the garment reaches the consumer. Sanforization is a specific, trademarked mechanical process using a compressive rubber belt to achieve this. Other pre-shrinking methods include steam relaxation and chemical treatments, but Sanforization remains the most widely used and consistently effective mechanical approach. --- ## See It in Practice Your size stays your size. That's the promise. Free returns · 30 washes guaranteed · ₹1,299 **Shop:** https://amzn.to/3P2XaNk --- *© 2026 Boring Label. All rights reserved.* [Visit boringlabel.com](https://boringlabel.com) | [Email us](mailto:hello@boringlabel.com)