A rashguard is a close-fitting, stretchable top designed to protect the skin from irritation, sun exposure and a little abrasion during water and outdoor sports. In the world of swimming, surfing, martial arts and outdoor activity, the rashguard has earned its place as a versatile staple. But what is a rashguard exactly, and why has it become a go-to garment for beginners and professionals alike? This guide unpacks the science, sport-specific uses, fabric technology and practical buying advice you need to choose the right rashguard for you.
What is a Rashguard? An Everyday Definition
What is a rashguard in its simplest form? It is a tight, usually long-sleeved or short-sleeved top made from synthetics such as polyester, nylon (polyamide) and elastane (spandex/Lycra). The fabric is chosen for its stretch, wicking properties and quick-drying behaviour. The garment is designed to stay close to the skin, reducing friction against other surfaces—hence the term “rash guard.”
Rashguard versus Rash Guard: Variation in Naming
You may see it written as “rashguard” (one word) or as two words, “rash guard.” Both refer to the same item, but manufacturers and retailers often prefer one form. In headings and product names you’ll encounter the capitalised version, such as What is a Rashguard, which helps them stand out in lists and search results.
Why People Wear Rashguards
There are several practical reasons to wear a rashguard, depending on your activity and environment. Some of the core benefits include:
- Protection from sun (ultraviolet rays) with UPF ratings
- Prevention of skin irritation and chafing from wetsuits, boards or ropes
- Warmth and insulation in cooler water or breezy days
- Layering option under wetsuits, life jackets or winter shells
- Improved comfort during exercise by reducing drag and enhancing fit
What is a Rashguard Made Of? Fabrics and Fabric Construction
The material composition of rashguards is key to their performance. Most high-quality rashguards combine a stretch fibre (elastane) with a moisture-wicking base fabric such as polyester or nylon. This combination delivers a snug fit, freedom of movement and fast drying after activities in water or sweat.
Common Fabric Technologies
– Polyester with elastane: A standard choice offering durability, colourfastness and good water repellency.
– Nylon (polyamide) with elastane: Known for its resilience, softness and excellent quick-dry properties.
– Recycled fibres: Some rashguards use recycled polyester or recycled nylon to reduce environmental impact.
– UV-treated fabrics: Many rashguards include built-in UV protection, often marketed as UPF 50+ or UPF 50+, helping to shield the skin from strong sun exposure.
Weave and Weight: Lightweight, Midweight and Heavyweight Options
Rashguards come in a spectrum of weights. Lightweights are ideal for warm days and high-mingling sports where maximum mobility matters. Midweight options balance warmth and breathability for cooler conditions. Heavyweight rashguards provide extra insulation and durability for tougher sessions or cooler climates. The weight often correlates with thickness and the fabric’s capacity to protect or insulate.
Key Features to Look For in a Rashguard
While the basic purpose is simple, there are several design features worth noting when selecting a rashguard. These features can enhance comfort, longevity and performance during activities such as surfing, swimming or martial arts.
Seam Construction: Flatlock and Overlocked Options
Flatlock seams reduce chafing by lying flat against the skin, making them a popular choice for long sessions in water or during grappling. Overlocked (serged) seams are common too and often lighter on the skin but may be more prone to irritation if the fabric quality is lower. Look for rashguards with reinforced panels or flatlock stitching at stress points for durability.
Fit and Compression
A rashguard is intended to be snug, almost like a second skin. A proper fit ensures maximum protection and performance by minimising movement that could cause rubbing or pull the fabric out of position. Some athletes prefer a light compression feel, while others opt for a relaxed, athletic fit depending on activity and comfort.
Hems, Cuffs, and Necklines
Thumb-sleeve length, raglan sleeves or standard sleeves affect range of motion. Necklines vary from crew necks to shallow V-necks; some designs include a zip for easy on/off and adjustable ventilation. The cuffs should be secure but not tight, with hems designed to stay in place during vigorous movement.
What is a Rashguard Used For? Sport-Specific Guides
Rashguards are popular across a wide range of activities. Here’s how they are typically utilised in different sports and settings.
Surfing and Watersports
In surfing, a rashguard serves as a protective layer between the skin and the waxy deck of the board, preventing friction burns and rash from repeated paddling. For warm, sunny days, a short-sleeve rashguard provides sun protection without the bulk of a wetsuit. In cooler water or windier days, long-sleeve rashguards add warmth and reduce wind chill while still allowing for mobility.
Swimming and Open Water
Competitive swimmers or recreational swimmers wear rashguards to cut drag and protect the torso from sun or chlorine. In open-water settings, UPF-rated rashguards help combat UV exposure during longer swims and practice sessions in daylight.
Martial Arts and Grappling
In disciplines such as Brazilian Jiu-Jitsu (BJJ) and mixed martial arts, rashguards reduce friction against the skin and scraps of friction that can lead to rashes and mat burn. These are often worn as a base layer under gees or as stand-alone tops during training or competitions. Breathable, sweat-wicking fabrics help maintain grip and comfort on the mat.
Outdoor Recreation
Rashguards are versatile for hiking, kayaking, sailing or climbing. They provide sun protection for arms and shoulders, wick sweat away during exertion and offer a light layer against wind and light chill at altitude or on sea breezes.
What is a Rashguard vs Wetsuit? Making Sense of the Gear
For newcomers, distinguishing between rashguards and wetsuits can be confusing. A rashguard is a lightweight garment designed for sun protection and abrasion resistance, typically worn in warmer conditions or as a base layer. A wetsuit, by contrast, is a full-body or partial-body neoprene suit that traps a thin layer of water to insulate the body. Wetsuits are designed for thermal protection and buoyancy, whereas rashguards provide protection and comfort without significant insulation. In practice, many people layer a rashguard under a wetsuit to improve fit, reduce chafing and extend the wetsuit’s life.
Practical Combinations
For UK waters, you might choose a short-sleeve rashguard under a shorty or full wetsuit for summer months, or a long-sleeve rashguard under a 3/2 or 4/3 wetsuit for spring and autumn sessions. On particularly sunny days, an UPF 50+ rashguard can maintain skin protection even before you step into the water.
Choosing the Right Rashguard for You
Selecting a rashguard depends on your activity, climate and personal preferences. Here is a practical framework to guide your choice.
Consider the Activity
If you are a surfer in British seas, you may prioritise durability and sleeve length for sun coverage. For swim workouts, you might look for a lighter fabric with excellent drape and a snug fit. Martial artists will value a scar-free seam construction and robust, breathable tightly woven fabric.
Check the UPF Rating
UPF ratings indicate how well the fabric blocks ultraviolet radiation. A UPF 50+ rating means the fabric blocks 98% of UV rays, a significant factor for skin health during extended outdoor exposure. If you spend long hours outdoors, prioritise UPF 50+ with durable colour retention and wash resistance.
Decide on Sleeve Length and Fit
Short-sleeve rashguards are cooler and more flexible for warm climates, while long-sleeve versions provide additional protection and coverage. If you plan to wear gloves or a watch on the same activity, ensure the rashguard sleeve ends won’t ride up when you move.
Think About The Fit and Comfort
Look for a snug but not overly tight fit. If the fabric feels restrictive, you may struggle with range of motion. If it feels loose, it may ride up and offer less protection. A well-fitting rashguard should stay in place during movement and dry quickly after exposure to water or sweat.
Budget and Longevity
Rashguards vary in price according to fabric quality, UPF rating and construction. A mid-range rashguard with good stitching and a reputable fabric blend can offer several seasons of use if properly cared for. Consider value over price; a higher-quality garment often lasts longer and performs better.
Care and Maintenance: How to Extend Your Rashguard’s Life
Proper care keeps a rashguard looking and performing well for longer. Here are practical tips to keep your rashguard at its best.
Washing and Drying
Rashguards are best washed in cold or lukewarm water. Use a mild detergent and avoid fabric softeners or antibacterials that can break down the fibres. Rinse thoroughly and lay flat or hang to dry away from direct heat sources. Do not tumble dry on high heat, as this can degrade elasticity over time.
Chlorine and Saltwater Care
Chlorine can break down the fabric over time, so rinse promptly after use. Saltwater can also dry out the fibres; a fresh rinse and air dry will help preserve elasticity and colour. If you swim in heavily chlorinated pools or sea water, consider a rinse-without-wash between sessions to prolong life.
Storage Tips
Store rashguards flat or folded to avoid creases that may degrade the fabric. Keep away from direct sunlight to preserve colour and UPF performance.
Environmentally Conscious Choices in Rashguard Fabrics
In recent years, the market has seen a growing emphasis on sustainable fabrics. Consumers can look for rashguards made from recycled polyester, recycled nylon or other eco-conscious blends. Some brands also offer products using bluesign-certified fabrics or certifications that track the sustainability of the supply chain. If environmental impact is important to you, seek out rashguards with transparent sourcing and durable construction that extends the garment’s life.
Common Questions About What is a Rashguard
Is a rashguard good for sun protection?
Yes. A UPF-rated rashguard provides substantial protection from the sun’s UV rays, reducing the risk of sunburn on exposed arms and shoulders. It should be noted that no fabric offers 100% protection, so for prolonged exposure you may still want to apply sunscreen to exposed areas not covered by the rashguard.
Can a rashguard be worn under a wetsuit?
Absolutely. Wearing a rashguard under a wetsuit helps reduce friction between the skin and neoprene, minimises chafing, improves moisture management and can provide extra warmth depending on the fabric and thickness.
What is the best rashguard for beginners?
For beginners, a midweight rashguard with flatlock seams and a snug but comfortable fit is a practical starting point. Prioritise UPF 50+ if you expect strong sun exposure and choose sleeves that match your climate—short sleeves for warmer days, long sleeves for cooler conditions or extra sun protection.
How do you wash a rashguard properly?
Rinse after use, wash on a gentle cycle with cold water and a mild detergent, avoid fabric softeners, and air dry away from direct heat. This routine helps preserve elasticity, colour and UPF properties over time.
Putting It All Together: A Rashguard Buying Checklist
Before you buy, run through this checklist to ensure you get a rashguard that serves you well across activities and seasons:
- Activity needs: surfing, swimming, running, martial arts or outdoor adventure
- UPF rating: aim for UPF 50+ where sun exposure is a concern
- Fabric blend: polyester or nylon with elastane for stretch and drying
- Fit: close but comfortable; not overly tight or overly loose
- Seams: prefer flatlock or reinforced seams for durability
- Sleeve length: short or long, depending on climate and use
- Care: machine washable with cold water; avoid heat and fabric softeners
- Ethics and sustainability: recycled materials or certifications where possible
Summary: Why a Rashguard Belongs in Your Gear Kit
What is a rashguard if not a practical, multi-use garment that protects skin, supports performance and extends the life of other equipment? From the beach to the gym, from open water swims to long surf sessions, the rashguard offers a balance of protection, comfort and durability that makes it a staple for many athletes and outdoor enthusiasts. With the right fabric, fit and care, a rashguard can be a reliable companion across seasons and sports, helping you stay comfortable and focused on your performance.
Whether you are a keen surfer catching early morning waves off the British coast, a swimmer enjoying a long lap in the pool, or an MMA practitioner prioritising skin protection and comfort on the mats, understanding what is a rashguard and how to choose the right one will help you get the most from this versatile garment. Embrace the options, evaluate the features that matter most to you, and you’ll find a rashguard that not only protects your skin but also enhances your overall experience in and out of the water.