Hayabusa Core Short-Sleeve Rash Guard - Dark Green

The Hayabusa Men's Core Short Sleeve Rash Guard is designed for BJJ practitioners and MMA fighters who want a rash guard that feels like a second skin, wicks away moisture quickly, and stays in place during sparring. Featuring an advanced 200 GSM four-way stretch fabric, a silicone-lined waistband, and a lockdown loop to secure the rash guard to your shorts, this rash guard delivers top performance without distractions. Stay dry, stable, and focused during every session.

Features

• Advanced 200 GSM high-tensile fabric for relentless durability
• Silky-soft fabric with adaptive stretch for a fit that moves with your body
• Silicone-lined waistband that keeps the rashguard in place
• Lockdown loop at the hem to secure the rashguard to your fight shorts
• Bonded seam construction at the neck for friction-free comfort
• Moisture-wicking, quick-dry design for elite performance
• Reinforced flatlock stitching for indestructible durability
• Extensive size range from Small to 3X-Large

Usage

The Core Short Sleeve Rash Guard is specifically designed for Brazilian Jiu-Jitsu and MMA training. The rash guard is ideal for:

• No-gi BJJ training and open mats
• Submission grappling and wrestling
• BJJ competitions and tournaments
• MMA sparring and clinching
• As a base layer under your gi for extra comfort and protection
• Cross-training and functional fitness

The short sleeves offer optimal freedom of movement around the shoulders, ideal for grappling techniques, arm locks, and shoulder-intensive work.

Why a rash guard?

A good rash guard is indispensable for BJJ and MMA practitioners. It protects your skin from mat burns, scrapes, and bacterial infections such as staph and ringworm, which are common in grappling gyms. In addition, a rashguard wicks away sweat, keeps you cool, and reduces the risk of skin irritation caused by friction between your skin and that of your training partner. In other words, it’s not only comfortable but also an important hygiene precaution.

Material and Construction

The Core Rash Guard is made from a 200 GSM polyester-elastane blend with four-way stretch. This composition offers several advantages: the four-way stretch allows the fabric to move with your body in all directions, the silky-soft texture feels smooth against the skin, and the quick-dry properties wick away sweat quickly. The reinforced flatlock seams prevent irritation during prolonged contact with the mat or your training partner, and ensure that the rash guard retains its shape after hundreds of rolling sessions.

Locked-in Fit

A crucial detail that sets the Core Rash Guard apart is its smart closure system. The silicone-lined waistband grips gently against your skin or your fight shorts, preventing the rash guard from riding up during rolling. The lockdown loop at the hem allows you to attach the rash guard directly to your fight shorts for a fully locked-in, competition-ready fit. No more shirts riding up in the middle of a scramble—you stay completely focused on your technique.

Neck Design

The neckline features a bonded seam construction instead of a traditional stitched hem. This eliminates friction points around the neck, which is essential during grappling techniques such as chokes and collar work. The result is a rash guard that feels comfortable, even during long technical sessions.

Size Guide

The Core Short Sleeve Rash Guard is available in six sizes, from Small through 3X-Large. Use the guidelines below based on your chest circumference and height:

• Small – chest circumference approximately 91–97 cm, height 1.68–1.75 m
• Medium – chest circumference approx. 97–104 cm, height 1.75–1.80 m
• Large – bust size approximately 104–112 cm, height 1.80–1.85 m
• X-Large – bust size approximately 112–119 cm, height 1.85–1.90 m
• 2X-Large – chest circumference approximately 119–127 cm, height 1.90–1.95 m
• 3X-Large – chest circumference 127 cm and up, height 1.95 m and up

Rash guards are designed to fit snugly like a second skin. Therefore, choose your regular size—not a larger one. Not sure? Follow the guidelines above based on your chest circumference.

Who is it for?

This rashguard is suitable for beginners, intermediate, and advanced BJJ practitioners, grapplers, and MMA fighters. Beginners just starting no-gi training appreciate the protection against mat burns and skin irritation, while advanced and competitive athletes choose the Core for its locked-in fit and premium features. The short sleeves are ideal for hot gyms and athletes who want maximum shoulder mobility.

Care

The Core Rash Guard is easy to care for. It’s machine washable and dryer safe—no fuss. Wash on cold with like colors to keep the color and print looking fresh for a long time. Avoid bleach and wash the rash guard inside out to protect the prints and silicone waistband. Wash the rash guard after every workout; this is essential for hygiene in grappling sports.

Color Options

Available in four classic colorways:

• Black – timeless and versatile, pairs with any fight shorts
• Red – a bright, eye-catching color with an energetic vibe
• Blue – sleek and professional
• Green – modern, sporty look

Specifications

• Material: 200 GSM, four-way stretch polyester/elastane blend
• Waistband: silicone-lined, non-slip hem
• Lockdown loop at the hem for attachment to fight shorts
• Bonded seam construction at the neck
• Reinforced flatlock stitching
• Moisture-wicking, quick-dry properties
• Machine washable and dryer safe

With the Hayabusa Men’s Core Short Sleeve Rash Guard, you’re choosing a rash guard that combines high-level performance, fit, and comfort. The ideal choice for any BJJ practitioner or MMA fighter looking for a reliable training partner that stays put, session after session.

Do you have questions about the delivery of your order? First look carefully at the delivery time of your product. Below you will find an overview of the different products and delivery times. 

All products are immediately available

Orders that are immediately available and placed before 5:00 PM will be shipped the same day (Monday to Friday) from our warehouse and picked up by PostNL or DHL. You will receive a track & trace code the same day to follow your package. PostNL or DHL delivers the order the next day to the location of your choice in the Netherlands and Belgium. 

If you place an order for which all products are immediately available on Friday after 5:00 PM, Saturday or Sunday, we will ship it on Monday. In this case you will receive your order on Tuesday.

One or more products have a delivery time

In addition to our stock that is immediately available, we also have external stock. These products have a delivery time of 1 to 10 working days. This delivery time is indicated for each product in the availability. If you place an order with multiple products of which one or more products has a longer delivery time, this delivery time applies to the entire order. 

Punching bags & puzzle mats

Punching bags, puzzle mats and packages with different dimensions or weight are sent with an external courier service. This courier service works just like DHL with a tracking code to track your order. The delivery time for this is 1 to 2 working days.

Different delivery times apply for orders outside the Netherlands and Belgium. Via the track & trace code you will find current information regarding the delivery time of your package.