Why Thread Kalaa doesn't do polyester, blends, or microfiber bedding

Thread Kalaa prints only on 100% cotton. We've turned down three categories of fabric — polyester, poly-cotton blends, and microfiber "silk-feel" sheets — even though they sell faster and cost less. Reasons: cotton breathes, synthetics suffocate; cotton biodegrades, synthetics shed microplastics for 500 years; cotton gets softer with time, synthetics pill and bobble; cotton supports an Indian handloom ecosystem, synthetics support a petroleum one. This is why the "no" is a hard one for us.

What we won't ever stock, and why

Over the past year, we've been offered dozens of ways to grow — most of them involve switching from 100% cotton to something cheaper, faster-moving, or more "wrinkle-free". We've said no to all of them. Here's the full honest list, with the reasons laid out.

No polyester bedding

Polyester is made from petroleum. It's spun into fibre, woven into fabric, and marketed as "silk-feel" or "wrinkle-free". It's cheaper to make, so it's cheaper to sell. And it's a disaster to sleep in:

• Doesn't breathe. Polyester fibres have no natural pore structure. Body heat and moisture get trapped. You wake up warm and sticky. In Indian summer with a fan, this is the difference between a good night's sleep and a bad one.
• Sheds microplastics. Every wash releases thousands of microplastic fibres into the water system. They don't biodegrade. They end up in rivers, oceans, and inside fish — and then us.
• Short lifespan. Polyester sheets look "like new" for a year or two, then start pilling, catching static, and feeling plasticky. Within 5 years they're trash. A good cotton sheet lasts 10 to 15 years.
• Can't be hand-block printed. Hand-block pigment binds to natural fibres like cotton, linen, and silk. On polyester it sits on the surface and peels off within a few washes.

No poly-cotton blends

Blends combine the worst of both worlds. The polyester percentage (often 50 or 65 percent) kills most of cotton's breathability. But the "cotton" label on the pack lets manufacturers charge a premium while using cheaper synthetic.

The sales pitch is always "wrinkle-free, easy-care". The reality: you lose the natural hand of cotton AND you shed microplastics in every wash. Blends are not a compromise; they're a worse version of both options.

No microfiber "silk-feel" sheets

Microfiber is finely spun polyester fibres marketed as a "silk alternative". The feel is initially smooth. Then it:

• Traps heat even worse than regular polyester (finer weave = less breathability)
• Creates static charge in dry weather
• Loses its smoothness fast as the fine fibres break down
• Is almost impossible to recycle at end of life

No bamboo rayon labelled as "cotton"

Bamboo rayon starts as a plant (bamboo) but is dissolved in heavy chemicals (carbon disulphide, sodium hydroxide) and reconstituted into a viscose fibre. The final product has little connection to bamboo. It's a chemically-processed fibre marketed as "natural" because of its source.

Rayon can feel pleasant, but calling it "natural" or "100% cotton" is misleading. We've seen bamboo rayon sheets on marketplaces that outright claim to be cotton. Not a chance.

Why the "yes" is a short list

Thread Kalaa prints on four cottons and nothing else:

• Percale cotton (220 TC) for everyday bedsheets
• Mulmul cotton (3-layer muslin) for dohars
• South cotton (handloom) for selected bedsheets with natural texture
• Canvas cotton for cushion covers and table covers

We also print on cotton with pure cotton batting for quilts and bed covers — no polyester fill, no down, no synthetic insulation.

Read our full guide to the four cottons: Which cotton bedsheet is right for you?

The sleep science argument

Cotton sleep research is overwhelming:

• Cotton absorbs about 25% of its weight in moisture before feeling damp. Polyester holds about 4%.
• Cotton has natural "pores" between twisted fibres that allow air exchange. Synthetics do not.
• Thermal regulation studies consistently show cotton-sleepers maintain body temperature better than polyester-sleepers through the night.
• For hot sleepers in warm climates (like most of India), cotton is not a preference — it is a requirement for comfortable sleep.

You've probably slept in a hotel polyester sheet and woken up warm, sticky, and vaguely uncomfortable without being able to say why. The sheet was the reason.

The craft argument

Beyond comfort, there's a cultural argument. Hand-block printing is a 400-year-old craft practiced in Sanganer, Bagru, and a handful of other Rajasthani towns. The craft only works on natural fibres — cotton especially. Every time a brand switches from cotton to polyester, that's work lost for a workshop. Across the industry, the switch to synthetics has halved the number of active Sanganer artisans in 25 years.

Thread Kalaa works with Sanganer workshops. Every cotton piece we sell is a vote for the craft to continue. A polyester piece would be the opposite.

If you want to understand the full craft, read: Sanganer Block Printing Explained — the 400-year-old craft.

The planet argument

Cotton biodegrades. Within a few years in soil, a cotton sheet returns to the earth. A polyester sheet persists for 400 to 500 years in landfill, slowly releasing microplastics the whole time.

Washing synthetic bedding is a daily contributor to ocean microplastics. One synthetic duvet shed about 700,000 microfibres per wash in a 2016 Plymouth University study. Multiply by every household, every wash.

Cotton isn't perfect — conventional cotton uses pesticides and water. But choosing cotton over polyester means your bedding doesn't persist as microplastic for centuries after you've stopped using it.

The honest trade-offs

Cotton has downsides. We'll name them:

• Wrinkles. Cotton wrinkles. Light steam-ironing fixes this in 60 seconds. Polyester doesn't wrinkle — but polyester is also petroleum.
• More care. Cold wash, air dry, no bleach. We've written the full care guide because cotton rewards gentler handling.
• Higher price. Cotton costs more. Hand-block printed cotton costs more again. A Thread Kalaa bedsheet starts around ₹1,500. A polyester "silk-feel" sheet online starts at ₹300.

If ₹300 polyester vs ₹1,500 cotton is the question, the honest answer is: you're buying different categories of thing. One is a slightly uncomfortable, chemically-processed, 2-year-lifespan object. The other is a 10-year natural-fibre heirloom made by a human in Sanganer, printed by hand, and ships worldwide. Both are "a bedsheet". Only one is bedding.

Related reading

• Which cotton bedsheet is right for you? A guide to percale, mulmul and south cotton
• Sanganer Block Printing Explained — the 400-year-old craft
• How to care for hand-block printed cotton

Frequently asked questions

— Written with love by Aditi Rai, founder of Thread Kalaa. Jaipur, 2026.