What Is Pima Cotton? Fiber Quality, Feel, Performance & Care

Pima cotton is a high-quality type of cotton fiber, grown mainly in the US, Peru, and Australia, known for its extra-long staple length. Compared to regular cotton, pima produces softer, stronger, and more durable fabrics that pill and fade less. In real clothing production, though, pima is subject to the same issues as other cottons—especially shrinkage and wrinkling—unless blended or specially finished.

If you see “100% pima cotton” or the Supima® trademark on a garment, expect a smoother, slightly silkier feel and better color retention over time compared to typical cotton. But premium fiber alone does not guarantee zero shrinkage or a premium garment—fabric construction and finishing matter just as much.

Key takeaways

• Pima cotton is a premium variety with longer, finer fibers for extra softness.
• Finished pima fabrics are still 100% cotton and behave much like other cottons.
• Tests show all 100% cotton fabrics, including pima, can shrink 5–10% in length after tumble drying.
• Pima fabric pills and fades less than regular cotton, but care and construction affect real-life results.
• Tumble drying increases shrinkage failure rates by about 10% compared to line drying.

What is pima cotton? The fiber explained

Pima cotton comes from Gossypium barbadense, a species with longer fibers (staples) than the common cotton plant. These fiber staples average 1.4–2 inches, compared to 0.8–1.1 inches for standard Upland cotton. Longer staple length allows yarns to be spun finer and stronger, creating a fabric surface that feels smoother to the skin, resists pilling, and holds dye well. The name “pima” traces back to the Pima tribe in the US Southwest, where this cotton was first cultivated on a large scale.

You’ll find pima marketed under its generic name or as “Supima” (an American-grown, certified brand), and often as a selling point for luxury T-shirts, bedding, and shirting. Its reputation is built on lasting softness, strength, and better color—all thanks to those extra-long fibers, provided the spinning and finishing match the fiber quality.

What makes pima cotton different from regular cotton?

The defining difference is fiber length. Longer fibers mean fewer ends exposed on fabric surfaces, reducing roughness and fuzz, so the material feels silkier, stays vivid longer, and resists abrasion and pilling. In physical testing, these advantages show up as better pilling grades and slightly higher bursting strength, but everyday wear depends almost as much on fabric knitting or weaving and finishing as on the raw fiber.

Property	Pima cotton	Regular (Upland) cotton
Staple length	1.4–2 in (35–50 mm)	0.8–1.1 in (20–28 mm)
Typical feel	Smoother, silkier	Soft but less smooth
Pilling tendency	Lower	Higher
Burst strength	Slightly higher	Standard

How does pima cotton fabric feel to wear?

Pima cotton feels smooth, soft, and almost creamy to the touch, especially in finely spun yarns or high thread count weaves. The low fiber ends give it a lustrous appearance and an absence of fuzz. It’s still breathable and absorbent, retaining the classic “cotton feel”—but with less roughness and better drape. Good for next-to-skin clothing, premium T-shirts, underwear, and luxury bedding.

If you notice your cotton T-shirt or bedding feels especially soft and stays that way after repeated washing and wearing, it may be made with pima or another extra-long staple variety—though, as this guide covers, fabric construction plays a major role too.

Pilling, fading, and performance: lab-tested results for 100% cotton

Pima’s fame rests on lower pilling and stronger, brighter fabrics. Our lab reports and production records for 100% cotton fabrics (including premium types like pima) back this up: among 213 lab-tested lots, the median pilling resistance grade was 4–5, the top score in 162 of 175 pilling tests. Pima is also less likely to stain or fade, with median color change after washing at 4/5 (1 = worst, 5 = best), and color fastness to sweat and rubbing at 3–4 and higher.

Pilling, color, and strength: 100% cotton, lab reports

Median grade, 1–5, higher is better

• Pilling resistance4.5/5
• Color change after washing4/5
• Wet rub-off3.5/5
• Bursting strength5/5

Interestingly, fabric weight (GSM) in finished 100% cotton, including pima, averaged 187 GSM after finishing—yielding medium-weight, durable clothes with a “substantial” hand, but also potential for heat retention and wrinkling.

Does pima cotton shrink? Real shrinkage test data

Pima cotton shrinks like other high-quality cotton when first washed and dried, especially if tumble dried. In 9,356 lots of 100% cotton tested after a single wash and tumble dry—including those made with pima—median shrinkage was 6% in length and 2% in width. The worst 10% of lots lost 10% or more of their length. Over half shrank 6% or more. Fabric weight increased as the fabric drew tighter and denser after washing.

100% cotton shrinkage after wash and tumble dry

Measured result

Test

Dimensional change after washing and tumble drying

Method

Finished-fabric quality check

Sample

9,356 lots, Jan–Sep 2026

Conditions

One wash, tumble dry

Result

Median length −6%, width −2%

This includes pima fabrics in real clothing production.

How much 100% cotton can shrink after one tumble dry

Length

−6%

Width

−2%

Fabric area

−7.9%

Why does pima cotton shrink, and can you prevent it?

Shrinkage in pima cotton happens for the same reasons as regular cotton. When the yarn is spun and fabric is knitted or woven, the fibers stretch and twist; the first washing and drying allows them to relax (“relaxation shrinkage”), tightening the structure. Tumble drying, heat, and agitation increase the effects. Specialty anti-shrink finishes and pre-shrinking treatments (like mercerization or sanforizing) can reduce shrinkage—but unless your garment is labeled “pre-shrunk,” expect some size loss, even with pima cotton.

Why pima cotton shrinks after washing

Problem

Garment is smaller after wash/dry

Why it happens

• Fibers relax and contract in water
• Heat from washing/drying tightens fibers
• No pre-shrunk or anti-shrink finish

What fixes it

• Buy pre-shrunk/preshrunk labeled garments
• Wash cold, line dry
• Follow care label exactly

How to wash and care for pima cotton so it lasts

Pima cotton is easy to care for, but it reacts to heat and rough handling just like standard cotton. Wash in cold or warm water (up to 30 °C/86 °F) and avoid tumble drying if you want to minimize shrinkage and preserve softness. Turn garments inside out to reduce abrasion, and avoid harsh bleach. Iron on medium if needed. Always check your garment care label, since blends and special finishes vary.

Best care settings for most pima cotton clothes

Machine wash at 30 °C (86 °F) or belowCool water keeps the dye and fiber stable. Hotter water can shrink the fabric, loosen dye or weaken elastane.

Non-chlorine (oxygen) bleach onlyChlorine bleach would strip the dye or yellow the fiber; oxygen bleach is gentler.

Line dryHang to dry; it keeps size and saves the fiber from dryer heat.

Iron on medium, max 150 °C (300 °F)Medium heat suits polyester, wool, silk, viscose and modal. Use a pressing cloth on dark colors to avoid shine.

Washing pima cotton clothes, step by step

1. Check and sort by color and care label.
2. Turn clothes inside out.
3. Wash at 30 °C (86 °F) on a gentle or cotton cycle.
4. Use liquid detergent; avoid bleach.
5. Line dry or lay flat to prevent shrinkage.
6. Iron on medium if needed.

Who should choose pima cotton?

Benefits: Who pima cotton suits

• Lovers of softness: Prefer silky, smooth textures for T-shirts, tops, or bedding.
• Sensitive skin: Low fiber ends mean a gentler touch compared to standard cotton.
• Quality-minded buyers: Willing to pay extra for products that retain color and resist pilling longer.
• Those who line dry: Pima’s strength and finish help clothing keep its look after repeated washes.

Downsides: When pima cotton is not the best choice

• Activewear or heavy use: While pima resists pilling, 100% cotton in general wicks poorly and dries slowly compared to synthetics or blends.
• No shrinkage guarantee: As the test data show, pima cotton is not immune to significant shrinkage after tumble drying.
• Budget concerns: Pima carries a premium price, especially in US-made products like Supima. For hardwearing work clothes, blends may be better value.

Pima cotton vs other fabrics: What about shrinkage and care?

Compared to polyester, cotton-polyester blends, or modal blends, all 100% cotton fabrics (including pima) shrink more and require more careful washing. In 9,356 cotton lots, median shrinkage was −6% in length after one tumble dry, compared to only −3% for 100% polyester (105 lots), and −4% for cotton-polyester blends (2,947 lots). GSM (grams per square meter) increased the most in natural fibers, showing that density and stiffness can rise after the first wash. So, pima’s premium feel aside, follow the same laundry cautions as regular cotton.

Fiber type	Median shrinkage (length, %)	Sample size
100% cotton (includes pima)	−6%	9,356 lots
Cotton-polyester	−4%	2,947 lots
100% polyester	−3%	105 lots
Viscose/modal/lyocell blends	−6% to −10%	380–51 lots

Want more context? You can compare modal (another soft, smooth fabric used in T-shirts and underwear) or browse all fabric guides for shrinkage and care data.

FAQ: Pima cotton, answered

Pima cotton: quick answers

How this guide was researched

This guide uses our production and lab records for 100% cotton fabrics from January to September 2026, including 9,356 finished lots and 213 detailed lab reports. Data covers shrinkage, pilling grades, color fastness, and finished weights (GSM), and includes both regular cotton and premium types like pima. For details of our independent testing process, see how we test.