Jiu Jitsu Gi Shrinkage Guide: How to Properly Wash and Care for Your BJJ Uniform

Every Brazilian Jiu Jitsu practitioner knows the frustration of putting on a freshly washed gi only to find the sleeves sitting awkwardly above the wrists or the pants riding up past the ankles. Understanding jiu jitsu gi shrinkage is essential for maintaining your investment and ensuring your uniform remains competition-legal and comfortable for years to come.

Whether you’ve just purchased your first gi or you’re a seasoned black belt looking to extend the life of your favorite training partner, this comprehensive guide will walk you through everything you need to know about preventing, managing, and understanding gi shrinkage.

Why Does Jiu Jitsu Gi Shrinkage Happen?

Before diving into prevention methods, it’s important to understand the science behind why your BJJ uniform shrinks in the first place. Most traditional gis are made from cotton weave materials—pearl weave, single weave, double weave, or gold weave—and cotton is a natural fiber that responds to heat and agitation.

When cotton fibers are exposed to hot water and high heat from dryers, the fibers contract and interlock more tightly. This process causes the fabric to become denser and smaller. The tension created during the weaving process is released when exposed to heat, causing the gi to shrink primarily in length rather than width.

Most gis will experience their most significant shrinkage during the first 3-5 washes, with some high-quality preshrunk gis experiencing minimal size changes after proper initial care.

The First Wash: Your Most Critical Step

The initial wash of your new gi is the most crucial moment in your garment’s lifecycle. This is when you’ll experience the most dramatic jiu jitsu gi shrinkage, so taking the right approach can save you from an ill-fitting uniform.

Cold Water Is Your Best Friend

Always wash your gi in cold water, especially during those first few washes. Cold water minimizes fiber contraction while still effectively cleaning your uniform when paired with the right detergent. Set your washing machine to a cold or cool setting—never warm or hot.

Skip the Dryer

High heat is the primary culprit behind excessive shrinkage. Instead of using a dryer, air dry your gi by hanging it on a sturdy hanger or laying it flat. If you’re in a humid environment, positioning a fan nearby can speed up the drying process without introducing damaging heat.

Some practitioners prefer to hang their gi pants upside down (waistband at the bottom) to allow gravity to help maintain length during the drying process.

Long-Term Gi Care Strategies

Once you’ve successfully navigated those critical first washes, maintaining your gi’s size and condition becomes a matter of consistent, proper care habits.

Washing Best Practices

• Wash immediately after training: Don’t let your gi sit in your gym bag where bacteria can multiply and odors can set in
• Use mild detergent: Harsh chemicals can break down cotton fibers over time
• Add white vinegar: A cup of white vinegar in the wash helps eliminate odors and bacteria without damaging fabric
• Turn gi inside out: This protects any patches or embroidery and reduces friction on the outer surface
• Avoid fabric softener: It can leave residue that makes the gi slippery during training and can irritate skin
• Don’t overload the washer: Your gi needs room to agitate properly for thorough cleaning

Drying Techniques That Preserve Size

While air drying is ideal for preventing jiu jitsu gi shrinkage, some practitioners do use dryers strategically. If you must use a dryer, follow these guidelines:

• Use only the lowest heat or air-dry setting
• Remove the gi while it’s still slightly damp (about 80-90% dry)
• Hang immediately to finish air drying
• Never leave a gi in a hot dryer for extended periods

For those training multiple times per day who need their gi dry quickly, investing in multiple training uniforms is more practical than risking damage with aggressive drying methods.

What to Do If Your Gi Has Already Shrunk

If you’ve already experienced significant jiu jitsu gi shrinkage, all is not lost. While you can’t completely reverse shrinkage, you can sometimes recover a bit of lost length through a process called “blocking.”

To block a shrunken gi, soak it in cool water with a small amount of hair conditioner for about 15 minutes. The conditioner helps relax the cotton fibers. Gently stretch the gi while it’s wet, focusing on length rather than width. Lay it flat or hang it to dry while gently pulling it to the desired dimensions every hour or so until completely dry.

This method won’t work miracles, but it can recover a quarter to half an inch in some cases—potentially the difference between a legal and illegal gi for competition.

Choosing a Gi With Minimal Shrinkage

Prevention starts at purchase. When shopping for a new gi, look for these shrinkage-reducing features:

• Preshrunk fabric: Quality manufacturers pre-wash their gis to remove most potential shrinkage
• Reinforced stitching: Prevents distortion even if minimal shrinkage occurs
• Size charts that account for shrinkage: Reputable brands provide detailed sizing information
• Pearl weave or ripstop fabrics: These materials typically shrink less than traditional single or double weave

Quality construction and materials make a significant difference in how your gi holds up to repeated washing and training. Investing in a well-made uniform saves money and frustration in the long run.

The Truth About “Shrink to Fit” Sizing

Some practitioners intentionally buy oversized gis and use controlled shrinkage to achieve a perfect fit. While this can work, it’s risky for beginners who may not have experience gauging exactly how much a particular gi will shrink.

If you’re attempting this method, research the specific brand and model thoroughly, as shrinkage rates vary significantly between manufacturers and fabric types. Start with cold washes and gradually introduce slightly warmer temperatures while monitoring the fit closely.

Frequently Asked Questions

How much shrinkage should I expect from a new BJJ gi?

Most non-preshrunk gis will shrink 2-5% in their first few washes, primarily in length. Preshrunk gis typically shrink less than 2%. A size A2 gi might lose 1-2 inches in sleeve and pant length if not properly cared for. Always check the manufacturer’s specific shrinkage estimates and follow their care instructions carefully.

Can I unshrink a gi that went through the dryer?

Partial recovery is possible using the blocking method described above—soaking in cool water with conditioner, then gently stretching while drying. However, you typically can’t restore a gi to its original size once significant heat shrinkage has occurred. The best approach is prevention through proper washing and air drying from the start.

Is it okay to wash my gi in hot water to intentionally shrink it?

While hot water will cause jiu jitsu gi shrinkage, this approach is risky because you can’t precisely control how much shrinking occurs. The gi might shrink unevenly or excessively. If you need a smaller size, it’s better to exchange your gi or use the controlled “shrink to fit” method with progressively warmer (not hot) water while monitoring results.

How often should I wash my BJJ gi?

You should wash your gi after every single training session, without exception. Allowing sweat, bacteria, and mat grime to sit in your gi not only creates hygiene issues but can also degrade the fabric faster. Washing immediately after training with proper techniques won’t cause excessive shrinkage if you use cold water and air drying methods consistently.