Does Hemp Shrink? What to Expect and How to Wash It

Yes, hemp can shrink. Most of the change usually happens in the first wash, and heat is what makes it worse. Washed cool and dried gently, a well-made hemp garment settles into its fit and then mostly stays there. Washed hot and tumbled on high, it can come out noticeably smaller.

Below, we explain why hemp shrinks, why two hemp garments can behave differently, and what we recommend for sleepwear, where fit and airflow both matter.

TL;DR

• Hemp can shrink, and the biggest change is usually in the first wash, when the fabric relaxes after manufacturing.
• Heat and rough agitation raise the risk. “Machine washable” does not mean “shrink-proof.”
• Knit, weave, blend and finishing matter as much as the word “hemp,” so no single percentage fits every garment.
• A safe routine: follow the care label, wash cool or cold on gentle, reshape while damp, then air-dry or use the lowest dryer heat.
• A garment that feels stiff or less airy right after washing has not necessarily shrunk. Let it dry fully first.

Table of Contents

• Why hemp shrinks
• How much will hemp shrink?
• What makes shrinkage worse
• A wash routine that protects the fit
• Damp is not the same as shrunk
• Why two hemp garments can behave differently
• Our perspective on hemp and shrinkage
• Hemp sleepwear built to be worn and washed
• Fixing a hemp garment that has already shrunk
• How hemp compares with linen and cotton on shrinkage
• Shopping tips for sleepwear
• FAQ
• Sources

Why hemp shrinks

Hemp is a cellulose fiber taken from the outer stem tissue of the plant. Hemp is made mainly from bast fibers, and like other natural cellulose fibers it reacts to water and heat. The fiber is not the whole story, though.

The most common cause is what textile cleaners call relaxation shrinkage. According to an EPA-hosted textile cleaning curriculum, fibers and fabrics are constantly stretched during manufacturing, especially along the length of the cloth. When water and cleaning let the structure loosen, the fabric pulls back toward its natural dimensions. The same source notes that the greatest change often happens during the first cleaning.

This is a construction issue, not a sign of poor quality. Cotton, linen and many other fabrics do the same thing. It is also why sewing guides tell you to wash fabric before cutting it. Utah State University Extension, for example, advises washing fabric first to eliminate shrinkage and remove excess dye.

The three kinds of shrinkage

The EPA curriculum separates shrinkage into types, and each one shows up differently in a pair of pajamas:

Differential shrinkage is the one people blame on the fabric when the real cause is a mix of materials. A hemp top with elastic, trim or a different thread can pucker at the seams because the parts respond differently to water and heat.

How much will hemp shrink?

No honest answer gives one number. The research shows a wide spread, because finishing and construction change the result.

One published experiment on pure hemp woven fabric reported washing shrinkage below 0.4% after a liquid-ammonia treatment. A separate industrial-washing evaluation found that the hemp fabrics it tested did not meet the usual plus-or-minus 2% dimensional target in both directions. Those are lab samples and industrial treatments, not retail pajamas, so treat them as a range of possibilities rather than a prediction for your own set.

What holds across sources:

• Woven fabric generally shrinks more along its length.
• Knitted fabric can change in both length and width, which matters for stretchy tees and lounge pants.
• Finishing can reduce shrinkage a lot, which is why two hemp shirts at different price points can behave differently.
• Blends (hemp with cotton, modal or elastane) follow the care rules of the most sensitive fiber in the mix.

The practical conclusion: plan for some change in the first wash, and check the fiber content and care label instead of assuming.

What makes shrinkage worse

The EPA guidance points to three drivers: moisture, heat and mechanical action. Each is something you control at home.

Hot water. It relaxes fibers faster and more fully. Cool or cold water relaxes them more gently.

High dryer heat. This is the most common reason a garment comes out a size smaller. Heat plus tumbling is the strongest combination.

Heavy agitation. A packed drum or a heavy-duty cycle pulls and compresses fabric. Consumer Reports’ laundry guidance stresses matching the cycle and temperature to the fabric and soil level, and sorting by fabric type, which is the same logic applied to hemp.

One caution from the EPA material: a “machine washable” label tells you the garment survives a washer. It does not promise the garment keeps its size under any setting.

A wash routine that protects the fit

Here is the routine we suggest for hemp sleepwear. Always let the sewn-in care label override it.

1. Read the label. Blends, dyes, prints, seams and elastic can all call for stricter instructions than the fiber alone.
2. Wash cool or cold on a gentle cycle. Add only like fabrics, so heavy items like jeans or towels do not drag against the garment.
3. Skip the hottest setting for the first wash. This is when most relaxation happens, so it is the wash to treat with the most care.
4. Remove it promptly. Do not leave wet hemp bunched in the drum.
5. Reshape while damp. Smooth the seams, pull the hems straight and lay the garment flat or hang it.
6. Air-dry, or use the lowest permitted dryer setting. Take it out slightly damp if you can and finish it on a rack.

The same care logic applies to other natural fibers. If you also sleep on linen, a guide to washing linen bedding gently covers lower wash temperatures that suit linen sheets, and the habits carry over to hemp pajamas: moderate temperature, gentle handling, careful drying.

We also wrote a longer walkthrough, how to wash hemp clothing to preserve fit, if you want the detail by garment type.

Can you wash hemp in the machine?

Usually yes, if the care label allows it. Machine washing is not the problem. Heat, agitation and over-drying are. A gentle, cool cycle with a light load is far kinder to the fit than a hot, heavy one.

Can you shrink hemp on purpose?

You can, with hot water and high dryer heat, but it is a blunt tool. Excess heat can weaken fibers and shorten the garment’s life, and you cannot control which parts shrink. If a garment is too large, a tailor is a safer fix than a hot dryer cycle.

Damp is not the same as shrunk

This is a point most care guides skip. Fibers swell when wet, and that closes some of the pore space between them. Research on hemp and linen fabrics found that air permeability dropped in the wet state by roughly 1.1 to 2.0 times. In plain terms, a damp hemp garment breathes less than a dry one.

That matters for two reasons. First, a piece that feels dense, stiff or a little snug straight out of the wash may simply be wet. Try it on only after it is fully dry. Second, if you sleep hot, you want the airflow back, so finishing the drying properly is part of keeping the comfort you bought hemp for. The fabric opens up again as it dries.

There is a related comfort effect. Many people find hemp feels softer after repeated washes, and that is a reason not to panic about a slightly crisp first wash.

Why two hemp garments can behave differently

Hemp performance is engineered, not guaranteed by the fiber name. A review of hemp fiber properties and processing describes how quality depends on extraction and processing steps such as retting, mechanical separation, yarn preparation, weaving or knitting, and finishing.

When you shop, these are the details that tell you the most:

• Fiber percentage. Pure hemp and a hemp-modal blend are not the same garment.
• Knit or weave. Knits stretch and recover differently from wovens.
• Weight. Lighter fabric tends to feel airier but may respond more to heat.
• Care instructions. A responsible brand states them clearly, and so should the product page.
• Sizing notes. Some makers account for first-wash relaxation in how they cut the garment, so it is worth reading the size guidance.

The same review is a reminder that hemp is not automatically cheap either. Price depends on yarn quality, blend, finishing, certification and construction, so a low price does not tell you how a piece will wash.

Our perspective on hemp and shrinkage

We make sleepwear, underwear and socks from natural, breathable fabrics like hemp, linen and modal, so this question comes up for us constantly. Our view is simple: shrinkage is a care and construction question, and customers deserve a straight answer instead of a promise that any fabric is immune.

We built our range around people who overheat at night, and for those sleepers the fit and the airflow are the whole point. A set that tightens in a hot dryer works against that. So we tell customers to treat the first wash with the most care, to read the label on the specific garment, and to dry gently. It costs a few minutes and protects the piece for years.

We also think natural does not mean fragile. Hemp rewards modest care with durability and a softer hand over time. If you want a deeper look at why we choose these fibers, see our piece on why choose hemp pajamas, and our guide to fabrics for night sweats if heat is your main concern.

— Jason

Hemp sleepwear built to be worn and washed

If you are ready to try hemp for sleep, start with our hemp sleepwear collection. You can also browse by fit: men’s hemp sleepwear or women’s hemp sleepwear. For a first set, the men’s short-sleeve hemp sleepwear set is a simple place to begin, and the hemp sleepwear set for two works as a gift. Each product page lists its care instructions, so you can plan the first wash before the package arrives.

Fixing a hemp garment that has already shrunk

If a piece came out snug, you have a few options before giving up on it.

1. Re-wet it fully. Soak it in lukewarm water for a few minutes with a little mild detergent or conditioner.
2. Stretch gently while damp. Lay it on a towel, ease it back toward its original shape, and pull seams straight.
3. Dry flat. Do not use the dryer for this step.
4. Repeat if needed. Small gains are normal. Do not force the fabric hard, because wet fibers can distort.

Results vary by garment. A small change from relaxation often reverses partly, while severe heat shrinkage may not. For structured pieces, ask a tailor.

How hemp compares with linen and cotton on shrinkage

Hemp and linen are close cousins in behavior. A comparison of linen and hemp woven fabrics found similar qualities such as breathability, durability and moisture-wicking, even though the fibers come from different plants and the fabrics are structured differently. In day-to-day care, that means the same habits work for both: cool washes, gentle drying, reshaping.

Cotton also shrinks, often noticeably in jersey knits, unless it was pre-treated. So choosing hemp does not add a shrinkage problem. It simply means you should not assume any natural fiber is dimensionally stable out of the box.

Shopping tips for sleepwear

• Buy for the size you will wear after the first wash. If you are between sizes, read the maker’s size notes before deciding.
• Wash a new garment on its own the first time, so you can see how it behaves and keep dye from moving to other items.
• Check seams and trim after washing. Puckering usually points to differential shrinkage, not a defect in the hemp.
• Keep the care label information, or photograph it, before cutting out tags.
• For comfort advice beyond shrinkage, our guide to choosing the most comfortable sleepwear walks through fabric, fit and season.

FAQ

Does hemp clothing shrink more than cotton?

Not necessarily. Both are cellulose fibers and both can relax in the first wash. The result depends on knit or weave, finishing and how you wash and dry, so follow the care label for the specific garment instead of comparing fibers in the abstract.

Is hemp clothing machine washable?

Often yes, but only when the garment’s care label says so. Blends, dyes, prints, elastic and seams can require stricter instructions than the hemp itself. For the best fit, choose a cool or cold gentle cycle and low or no heat for drying.

Is hemp fabric expensive?

It can be, but not always. Price depends on yarn quality, blend, finishing, certification and construction, and sources do not support a universal claim that hemp costs more or less than cotton or linen. Compare fiber content, care instructions and construction rather than price alone.

How long does hemp stay fresh?

There is no reliable universal number. Natural fibers can wick moisture and allow airflow, but freshness depends on how much you sweat, skin oils, ventilation, garment weight and how you launder it. Washing gently and drying fully keeps the fabric feeling its best.

Sources

• Training Curriculum for Alternative Clothes Cleaning (EPA)
• Hemp Fibre Properties and Processing Target Textile: A Review (PMC)
• The effects of yarn number and liquid ammonia treatment on hemp woven fabrics
• Laundry Tips That Will Save You Time (Consumer Reports)
• Air permeability study, Materials Science (Medžiagotyra)
• Comparison of end-use properties of linen and hemp woven fabrics
• Fabric preparation guidance (Utah State University Extension)

Recommended

• Avoid 7–12% Shrinkage: How to Wash Hemp Clothing to Preserve Fit
• Soften Hemp Fabric in 5–10 Wears or Skip to Soft Sleepwear
• Degumming and Cottonization Decide If Hemp Itches: 6 Steps to Avoid It
• What Makes Hemp Fabric So Special? The Eco-Friendly Revolution Explain