6 Best Swim Briefs For Triathlete Training for Speed

When you’re staring down the black line at 5:00 AM, the last thing you want is a suit that fights you through every rotation. Choosing the right training brief is about stripping away everything that creates drag so you can focus entirely on your stroke mechanics. These six picks are designed to help you shave seconds off your intervals and stay comfortable through the grind of a triathlete’s training block.

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Why Speed-Focused Swim Briefs Matter for Training

In the pool, drag is the silent enemy of efficiency. While board shorts or loose-fitting trunks might feel comfortable at the beach, they act like parachutes in the water, forcing your hips to sink and ruining your body position. A proper speed-focused brief minimizes surface area and keeps your profile streamlined, which is essential for developing the high-elbow catch and consistent body rotation required for open-water success.

Training in a performance-oriented brief also provides immediate feedback on your form. When your suit fits like a second skin, you can feel the water moving over your legs, helping you identify if your kick is too wide or if your hips are dropping. It’s a simple piece of gear, but it’s the foundation of every efficient swim set you’ll ever complete.

Speedo Endurance+ Brief: Best for Daily Sessions

If you are logging heavy yardage five or six days a week, the Speedo Endurance+ is the industry standard for a reason. Its proprietary fabric is engineered to be 100% chlorine-resistant, meaning it won’t bag out or lose its shape even after months of intense, chemical-heavy pool sessions. It’s a workhorse that doesn’t quit.

This brief offers a classic, reliable fit that stays put during flip turns and aggressive starts. It’s not the thinnest suit on the market, but the trade-off is unmatched longevity. If you want a "set it and forget it" suit that will survive your entire off-season training block, this is the one to buy.

TYR Durafast Elite Solid: Best for Chlorine Life

The TYR Durafast Elite is built for the swimmer who treats the pool like a second home. The fabric is slightly more compressive than the standard Speedo, which provides a nice, locked-in feeling during high-intensity interval training. It handles the harsh environment of public pools exceptionally well, resisting the degradation that usually turns spandex into a saggy mess.

I recommend this for triathletes who prioritize durability above all else. It is a no-nonsense, high-performance garment that holds its color and structure through countless hours of exposure. If you find yourself replacing suits every two months because of fabric breakdown, switch to this and you’ll save yourself a headache.

Arena Carbonics Brief: Best for Drag Reduction

The Arena Carbonics is for the triathlete who is obsessed with marginal gains. By utilizing a tighter weave and a more hydrodynamic cut, this suit actively works to reduce the friction between your skin and the water. It feels thinner and faster than most training briefs, making it an excellent choice for your weekly threshold or race-pace sessions.

Because it is designed for speed, the fabric is slightly less forgiving than a standard training suit. However, for those looking to simulate the feel of a race-day speedsuit without the high price tag, it’s a perfect bridge. It’s a specialized tool for when you need to feel your fastest.

Dolfin Uglies V-2 Back: Best for Comfort Fit

Sometimes the best gear is the kind you don’t notice at all. The Dolfin Uglies line is legendary for its comfort, featuring a slightly more generous cut that doesn’t pinch or bind during long, steady-state endurance swims. While it’s designed for training, it lacks the aggressive compression of a pure racing suit, making it ideal for those long recovery sessions.

Don’t let the fun patterns fool you; this is a serious training tool. The internal drawcord is robust and ensures the suit stays secure even during long sets of butterfly or intense kicking drills. If you struggle with suits feeling too restrictive or uncomfortable during two-hour sessions, this is your best bet.

Blueseventy Nero Fit: Best for Race Simulation

Blueseventy is a brand synonymous with open-water excellence, and the Nero Fit brings that pedigree into the pool. It offers a higher level of compression than almost any other training brief, which helps with muscle fatigue and blood flow during grueling sets. It feels like a miniature version of a technical racing suit.

This is the suit you wear on "test days" when you are trying to hit new personal bests in the pool. It’s not necessarily the most comfortable for a casual recovery swim, but it is unmatched for high-intensity training. If you are preparing for a race and want to get your body acclimated to the feeling of a performance suit, look no further.

Jolyn Mid-Rise Brief: Best for Secure Coverage

Jolyn has gained a massive following in the triathlon community for a reason: their suits are built to stay in place regardless of the intensity of the workout. The mid-rise cut offers a bit more coverage than a traditional racing brief, which many athletes find more secure during vigorous flip turns and starts. The fabric is thick, durable, and holds its shape perfectly.

This brief is perfect for the triathlete who wants a suit that feels bombproof. You won’t have to worry about adjusting your gear between sets, allowing you to focus entirely on your breathing and stroke count. It’s a reliable, high-quality option for any training environment.

Key Fabrics to Look for in Training Briefs

When shopping for training briefs, the material is the most critical factor. Look for blends of Polyester and PBT (Polybutylene Terephthalate), which are specifically engineered to resist the corrosive effects of chlorine. Avoid suits that are primarily Nylon/Spandex, as they will lose their elasticity rapidly in a pool environment.

• 100% Polyester: Excellent for longevity and chlorine resistance, but lacks stretch.
• PBT Blends: The "gold standard" for training, offering a balance of durability and comfort.
• High-Compression Lycra: Reserved for race-simulation; provides speed but wears out faster.

Proper Care to Extend Your Swim Brief Lifespan

The lifespan of your swim brief is determined more by your after-swim routine than the price of the suit. Chlorine is a harsh chemical that continues to eat away at fibers long after you leave the pool. Always rinse your suit thoroughly in cold, fresh water immediately after your swim to neutralize the chemicals.

Never wring out your suit like a towel, as this snaps the elastic fibers and causes permanent stretching. Instead, lay it flat in a towel and roll it up to squeeze out the excess moisture. Finally, always air dry your gear in the shade; direct sunlight is the fastest way to degrade the fabric’s integrity.

Finding the Right Fit for Maximum Hydrodynamics

A speed-focused brief should feel like a second skin, but it should never restrict your range of motion. If you feel "pinching" around the hips or thighs, the suit is either too small or the cut isn’t right for your body type. You want a snug fit that prevents water from "pooling" inside the suit, which creates unnecessary drag.

Always test your fit by doing a few practice turns in the locker room or at the shallow end. If the suit shifts or drags when you push off the wall, it is too loose. A properly fitted brief will move with your muscles, not against them, ensuring you stay as hydrodynamic as possible from the first length to the last.

Investing in a high-quality swim brief is one of the most cost-effective ways to improve your performance in the water. Whether you choose the rugged durability of a Speedo or the high-compression benefits of a Blueseventy, the right gear will help you stay focused on your training goals. Now, grab your goggles, pick the suit that suits your training style, and get back to the pool to put in the work.