Walking into a Brazilian Jiu-Jitsu gym for the first time can be intimidating. Between the new environment, the unfamiliar techniques, and the specialized gear, there is a lot to take in. For women, one of the most common questions about gear is how a rashguard should actually fit. Should it feel like a second skin, or is a little extra room okay?
Choosing the right fit is about more than just looking good on the mat; it is about performance, safety, and comfort. A rashguard that rides up during a roll can be distracting, while one that is too restrictive can hinder your movement. This guide will break down everything you need to know about sizing, compression fit versus relaxed fit, and how to find the perfect rashguard for your BJJ journey.
The Core Benefits of a BJJ Rashguard
Before diving into sizing, it is important to understand why rashguards are standard attire in BJJ and other grappling arts. Originally designed for surfers to prevent board rash and sunburn, rashguards have been adapted for martial arts to provide specific benefits on the mat.
A primary benefit is hygiene and skin protection. Grappling involves close skin-to-skin contact and friction against the mat, which increases the risk of rashes, mat burn, and skin infections like ringworm or staph. A high-quality rashguard acts as a barrier, protecting your skin from direct contact with the mat and your training partner.
Additionally, rashguards are designed with moisture-wicking technology to draw sweat away from the body, keeping you cooler and drier during intense training sessions. This temperature regulation is crucial for maintaining focus and comfort, whether you are drilling techniques or sparring live. The materials, typically a blend of polyester and spandex, offer durability and multi-way stretch, ensuring you can move freely without the garment restricting your range of motion.
- Moisture-Wicking Fabric
- A specialized textile blend (usually polyester and spandex) that pulls sweat away from the skin surface to the outer layer of the fabric where it can evaporate quickly, keeping the wearer dry and comfortable during high-intensity activity.
- Compression Fit
- A garment construction designed to apply uniform, gentle pressure against the skin and muscles. Compression rashguards fit tightly to minimize fabric movement, support blood circulation, and reduce the chance of your opponent grabbing excess material.
- Relaxed Fit
- A looser, more casual garment construction that provides greater airflow and less constriction around the torso. Relaxed fit rashguards prioritize everyday comfort over maximum grip resistance during competitive rolling.
Compression Fit vs. Relaxed Fit: What is the Difference?
When shopping for a rashguard, you will often encounter two main fit options: compression fit and relaxed fit. Understanding the difference is key to making the right choice for your training style and comfort preferences.
A compression fit rashguard is designed to be snug and form-fitting. It hugs the body closely, providing a streamlined silhouette. This tight fit offers several advantages, particularly for grapplers. The compression can help improve blood flow and support muscle movement, potentially enhancing athletic performance and aiding in recovery after a hard session. Furthermore, a compression fit minimizes fabric movement, meaning the rashguard is less likely to ride up during dynamic movements like shrimping or technical stand-ups.
In contrast, a relaxed fit rashguard provides a more casual, looser feel. While it still offers skin protection and moisture-wicking properties, it allows for more airflow and a less restrictive feel. Some women prefer this fit for its sheer comfort, especially during lighter drilling sessions or when wearing the rashguard outside of training. However, the looser fabric can be more prone to shifting or bunching during intense rolling sessions.
Real-world example: Sarah, a blue belt from Austin, Texas, told us she always reaches for her compression rashguard when rolling because she can focus on her guard passes without worrying about her top riding up. But on recovery days, when she is just drilling techniques at half speed, she prefers the relaxed fit because it feels less constricting and more breathable.
Compression vs. Relaxed Fit: Side by Side
| Feature | Compression Fit | Relaxed Fit |
|---|---|---|
| Fit | Snug, form-fitting, hugs the body | Looser, more casual feel |
| Best For | Competitive grappling, live rolling, no-gi training | Light drilling, casual training, everyday wear |
| Fabric Movement | Minimal shifting, stays locked in place | May ride up or shift during dynamic movements |
| Muscle Support | Yes — promotes blood flow and recovery | Minimal compression benefit |
| Grip Resistance | Excellent — less fabric for opponents to grab | Moderate — looser material can be gripped |
| Comfort Level | Firm pressure, takes getting used to | Immediate comfort, less constricting |
| Versatility | Primarily for training and competition | Can be worn on and off the mat |
Ultimately, the choice between compression and relaxed fit is personal. If your primary focus is competitive grappling or intense sparring, a compression fit is generally recommended for its security and muscle support. If you prioritize absolute comfort and versatility, a relaxed fit might be the better option.
How to Measure for the Perfect Fit
Finding the right size involves more than just guessing. To ensure your rashguard performs as intended, you need to take accurate body measurements. Here is a step-by-step guide to measuring yourself correctly.
Gather Your Tools
You will need a soft, flexible measuring tape. If you do not have one, you can use a string and measure it against a ruler afterward.
Measure Your Chest
Place the measuring tape around the fullest part of your chest, wrapping it under your armpits and across your shoulder blades. Ensure the tape is level and snug, but not digging into your skin.
Measure Your Waist
Identify the narrowest part of your natural waist, usually located above your belly button. Wrap the tape around your waist, keeping it level all the way around.
Measure Your Hips
Stand with your feet together and measure around the fullest part of your hips and buttocks. This is crucial for ensuring the rashguard has enough length and stretch in the lower torso area.
Once you have your measurements, compare them to the specific brand’s size chart. Sizing can vary significantly between manufacturers, so always rely on the chart provided for the specific rashguard you are considering.
General Sizing Chart Based on Weight
While specific measurements are best, weight can be a helpful general guideline when starting your search.
| Weight (lbs) | Recommended Size |
|---|---|
| 100 – 130 | XS |
| 130 – 160 | S |
| 160 – 190 | M |
| 190 – 220 | L |
| 220 – 250 | XL |
| 250+ | XXL |
This is a general guideline. Always refer to the specific brand’s size chart for the most accurate fit.
Common Fit Issues and How to Solve Them
Even with careful measurement, you might encounter fit issues. Addressing these problems quickly will save you from frustration on the mat.
The Rashguard Rides Up
One of the most common complaints is a rashguard that rides up during movement. This can happen for several reasons. If the rashguard is too large, it will slide and bunch up. Conversely, if it is too tight, it may be pulled up as your body moves.
To solve this, ensure you have chosen the correct size. Look for rashguards with features like anti-slip hems or silicone grips at the waistline. Another practical solution is to tuck the rashguard into your spats or shorts, or use a small piece of anti-slip tape on the inside hem to keep it anchored.
Pro tip: The Hayabusa Apex and other grappling-specific rashguards feature anti-slip silicone hems that lock the garment in place against your shorts, eliminating ride-up almost entirely. If this is a recurring issue for you, investing in a rashguard with this feature can be a game-changer.
The Rashguard Feels Too Tight
If your new rashguard feels incredibly tight, like you are being squeezed, it might be too small. However, keep in mind that compression rashguards are meant to be snug. They might feel restrictive at first, but they should not impede your breathing or range of motion.
Give it a couple of training sessions. If you still feel like you are fighting your gear rather than your opponent, it is time to size up. Also, check the material. Some brands use thicker, less stretchy fabrics, while others use ultra-thin, highly elastic materials.
The Rashguard Is Too Short
This is especially common for women with a longer torso. If the rashguard is cutting off above your waistline when you reach overhead, it is too short for your body proportions. Look for brands that offer extended-length torsos or consider sizing up and accepting a slightly looser fit elsewhere in exchange for the extra length you need.
Frequently Asked Questions
Yes, absolutely. Many women choose to wear a rashguard under their gi jacket for added hygiene, moisture absorption, and to prevent the rough gi fabric from causing chafing. A snug, well-fitting rashguard is ideal for this purpose, as it provides a smooth layer between your skin and the gi.
To prevent ride-up, choose a rashguard with a compression fit and anti-slip features like silicone hems. Tucking the rashguard into your spats or shorts can also help secure it in place. Additionally, ensuring you have the correct size is crucial; a rashguard that is too loose will inevitably slide up.
While they are similar, they are not exactly the same. Compression shirts are generally designed for gym workouts and may focus more on muscle support and recovery. Rashguards, specifically designed for grappling, often feature more durable stitching like flatlock seams to withstand the friction of the mat and may have longer torsos to prevent ride-up during rolling.
With proper care, a high-quality rashguard can last through many training sessions. However, you should replace it when you notice significant wear, such as stretched-out elastic bands, fading compression, loose threading, or thinning material. Most serious practitioners replace their primary rashguards every 6 to 12 months, depending on training frequency.
A compression fit rashguard is designed to be snug and form-fitting, hugging the body closely to minimize fabric movement and provide muscle support. A relaxed fit rashguard provides a more casual, looser feel with more airflow but can be prone to shifting during intense rolling sessions.
To measure for a women’s rashguard, you need three measurements: chest (around the fullest part of your bust), waist (at the narrowest point of your natural waist), and hips (around the fullest part of your hips). Compare these to the specific brand’s size chart before ordering.
Final Thoughts
Finding the right rashguard is a crucial step in building your BJJ gear arsenal. Whether you prefer the secure, supportive feel of a compression fit or the breathable, casual comfort of a relaxed fit, the key is ensuring it stays in place and allows you to move freely. By taking accurate measurements and understanding the features that work best for you, you can train with confidence and focus on what matters most: improving your jiu-jitsu.
Remember, every woman’s body is different, and the best rashguard is the one that fits your unique proportions and training style. Do not be afraid to try a couple of sizes or brands before settling on your go-to. The right rashguard will feel like it was made for you — and that feeling changes everything on the mat.
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