Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.7 Best Swimming Shorts For Training | 9″ vs 5″ for Training

The difference between a good lap session and a miserable one often comes down to what you wear. A heavy, baggy board short creates drag, traps water, and leaves you feeling like you’re swimming in a wet blanket. The right pair of training-specific swim trunks eliminates that friction, dries before you towel off, and lets you focus entirely on form and endurance. This guide breaks down the best options for your next swim.

I’m Mohammad — the founder and writer behind ProteinJug. I’ve spent countless hours analyzing the construction, fabric blends, and liner designs of swim trunks to determine which ones hold up to chlorine, saltwater, and daily pool use without falling apart.

Whether you’re grinding laps at sunrise or coaching from the deck, the right pair of swimming shorts for training balances compression, quick-dry performance, and a secure fit that stays put through every flip turn.

How To Choose The Best Swimming Shorts For Training

Training swim shorts are a different animal from casual beach trunks. You need a fit that won’t shift during a flip turn, fabric that sheds water instantly, and a liner that supports without chafing. Focus on these three specs to narrow your options.

Inseam Length and Fit

Inseam determines drag and range of motion. A 9-inch inseam offers generous thigh coverage and a conservative look, which is ideal for lifeguards or open-water swimming. A 5-inch or 7-inch inseam reduces drag and allows for a wider kick, making it the preferred cut for lap training. Fitted waistbands with internal drawstrings prevent the shorts from sliding down during starts and turns.

Compression Liner vs. Mesh Netting

The internal liner is the make-or-break feature for training. Mesh netting is common in beach trunks and causes chafing and bunching after a few hundred yards. A built-in compression liner, typically made from spandex or polyester-spandex blends, provides support, prevents fabric ride-up, and eliminates the need for separate underwear. This is a non-negotiable feature for any serious swimmer.

Fabric Composition and Durability

Chlorine and saltwater will break down cheap nylon quickly. Look for polyamide-elastane blends with four-way stretch. Fabrics like Arena’s Waterfeel Eco resist fading and maintain elasticity through hundreds of washes. UPF 50+ sun protection is an added benefit for outdoor training. Avoid cotton blends entirely — they absorb water and double the drying time.

Quick Comparison

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Model Category Best For Key Spec Amazon
Speedo Guard Volley Premium Lifeguards & All-Day Wear UPF 50+, 6.7 oz weight Amazon
Arena Feel Dynamo Premium Lap Swimming & Fitness 80% Polyamide 20% Elastane Amazon
maamgic 5″ Trunks Mid-Range River Trips & Comfort 5″ inseam, Zipper pocket Amazon
TYR Sport Short Mid-Range Low-Drag Lap Coverage Nylon, very lightweight Amazon
KANAV 3-Pack Jammers Budget Value Lap Training 3-pack, compression fit Amazon
HODOSPORTS 9″ Trunks Mid-Range Tall Builds & Coverage 9″ inseam, bike liner Amazon
SILKWORLD Trunks Budget Casual & Everyday Use 9″ inseam, zipper pocket Amazon

In‑Depth Reviews

Best Overall

1. Speedo Mens Guard Swimsuit Trunk Volley

UPF 50+Chlorine Resistant

The Speedo Guard Volley is purpose-built for the toughest training environment: all-day wear in sun, chlorine, and saltwater. Lifeguards and coaches put this suit through continuous use and report minimal fading and no fraying after entire seasons. The fabric is lightweight at just 6.7 ounces, yet it resists the degradation that destroys cheaper trunks within weeks. The shorter mid-thigh cut reduces drag during active swimming and diving, while the internal drawstring keeps the waistband locked in place through rapid movements.

This is a true volley-style suit — no netting, no compression liner, just a clean, supportive front lining that dries almost instantly. The minimal design means less material to trap water, so you transition from wet to dry faster than with baggy alternatives. It runs slightly snug and short, so anyone between sizes should consider moving up one. The elastic waist and stretch fabric accommodate a range of body types, but the intended fit is form-fitting for active performance.

After a full summer of daily guarding, one reviewer noted their Speedo Guard barely faded while a coworker’s six-year-old suit was still intact with no fraying. That level of durability makes this a long-term investment for anyone who trains or works in the water daily. The clean Speedo logo and classic color options keep it professional enough for guard rotations and stylish enough for casual swim sessions.

Why it’s great

  • Exceptional color retention after months of chlorine exposure
  • Lightweight, quick-dry fabric ideal for all-day wear
  • Secure drawstring waist prevents riding during flip turns

Good to know

  • Very short inseam may be too revealing for some users
  • Size up if you are between sizes due to snug fit
Lap Pick

2. Arena Men’s Feel Dynamo Swim Short

Waterfeel Eco4-Way Stretch

Arena built the Feel Dynamo around their Waterfeel Eco fabric, a blend of 80% polyamide and 20% elastane that delivers four-way stretch and serious chlorine resistance. This is a dedicated fitness short — not a casual beach trunk. The fitted cut reduces water resistance while you’re pulling through laps, and the supportive front lining provides light compression without a full bike liner. It’s sold as a swim brief but fits more like a snug, mid-length short, making it a strong option for pool workouts and aquatic fitness classes.

The 4-way stretch material moves naturally through every stroke, from freestyle to butterfly, without binding at the thighs. It also includes UPF 50+ sun protection, which is a meaningful addition for outdoor lap swimming or open-water training. The internal drawstring ensures the short stays secure during dives and explosive starts. Some users note it runs slightly small, so ordering one size up is a safe bet for most body shapes.

Most feedback is overwhelmingly positive — club swimmers and coaches praise the precise fit and the way the material holds its shape through frequent use. A minority of reviews mention less durable outer fabric after heavy use, though this seems isolated. At 85 grams, the shorts are nearly weightless when dry and shed water in seconds. For anyone prioritizing a streamlined, sport-specific fit for indoor or outdoor training, the Arena Feel Dynamo is a serious contender.

Why it’s great

  • Chlorine and saltwater resistant Waterfeel Eco fabric
  • Four-way stretch for unrestricted kick and pull
  • UPF 50+ sun protection for outdoor training

Good to know

  • Fitted cut runs slightly small; consider sizing up
  • A few reports of questionable long-term fabric durability
Slim Fit

3. maamgic 5inch Mens Swimming Trunks with Compression Liner

5″ InseamCompression Liner

Maamgic’s 5-inch swim trunks bridge the gap between a traditional jammer and a casual short by delivering a fitted profile with a real compression liner. The shorter inseam reduces drag and gives you full freedom of motion for a powerful kick. The internal compression liner is soft, stretchy, and grippy enough to prevent ride-up without squeezing — a feature that earns consistent praise from swimmers who hate the loose, saggy feel of board shorts. The outer shell is lightweight and dries quickly, making these appropriate for back-to-back training sessions or a quick dip followed by errands.

The side zipper pockets are a practical bonus for holding a key card or phone during trips to the pool deck or river banks — they lie flat and don’t create drag when empty. The elastic drawstring waist offers a customizable fit, though the drawstring color sometimes differs from product photos. The fabric is soft and breathable, with enough stretch to accommodate different body types without feeling restrictive. Reviewers consistently note the flattering fit and vibrant color accuracy.

One reviewer put these through river trips and rocky terrain and reported the material held up without snags or tears. Another non-binary buyer praised the internal liner for preventing chafing and staying secure above the hips. The 5-inch inseam will feel short if you’re used to 9-inch trunks, but the trade-off is superior mobility and faster drying. For lap swimming, open-water training, or any athletic water activity, this is a strong, comfortable choice.

Why it’s great

  • Compression liner eliminates chafing and ride-up
  • 5-inch inseam reduces drag and speeds up drying
  • Functional zipper pockets for small essentials

Good to know

  • Drawstring color may not match product listing photos
  • 5-inch length may be too short for conservative swimmers
Low Drag

4. TYR Sport Men’s Swim Short/Resistance Short Swim Suit

Nylon BuildBrief Liner

TYR has been a staple in competitive swimming for decades, and the Sport Short reflects that pedigree. It’s built like a drag suit but with more coverage and a comfortable brief liner inside. The outer shell is thin, lightweight, and almost papery — which sounds fragile but is actually intentional. That thin nylon structure creates low water resistance while providing modesty over a racing brief or jammer. Many former competitive swimmers use these as a transition piece when they want more coverage in the water without the bulk of board shorts.

This short uses a standard nylon construction, not a high-stretch polyamide-elastane blend. Expect average durability — one reviewer reported the navy pair faded with pink seams after a year of regular use, while a black pair looked like new after four months. The legs are roomy, the drawstring is secure, and the brief liner offers light support. It’s not as compression-focused as modern training shorts, but it excels as a low-profile, low-drag cover-up for lap swimming. The key pocket is a thoughtful touch for storing a locker key.

Size accuracy is a strong point — a 34-inch waist matches the size L comfortably, and the fit is true to the brand’s sizing chart. The material floats, which makes body positioning slightly easier for drills and kick sets. It’s a niche pick: not ideal for open-water or high-intensity training, but perfect for recreational lap swimming and anyone transitioning from briefs to shorts. For the price, you get TYR’s reliable construction and a classic design that won’t go out of style.

Why it’s great

  • Extremely lightweight and low-drag for lap swimming
  • Comfortable brief liner without restrictive compression
  • True-to-size fit with secure drawstring closure

Good to know

  • Nylon fabric may fade and lose shape faster than modern blends
  • Shiny satin-like finish may not appeal to everyone
Best Value

5. KANAV 3 Pack Men’s Athletic Square Leg Swimsuit Jammers

3-PackCompression Fit

The KANAV 3-pack offers budget-friendly entry into swim jammers without compromising on the essentials: compression fit, square-leg cut, and decent chlorine resistance. Each pair is form-fitting and lightweight, making them ideal for indoor lap swimming and pool workouts. The compression provides muscle support and reduces water drag, while the square-leg design offers slightly more coverage than a traditional brief. For beginners transitioning from board shorts, these are a comfortable step toward more performance-oriented swimwear.

Durability is the main trade-off at this price point. One experienced swimmer reported going through a pair every three to four months while swimming 2,500 yards three to four times per week. The material can stretch out, threads may pull, and seams can weaken over time. However, getting three pairs for the price of a single premium short makes this an excellent rotation system — swap them out and keep the chlorine damage spread across multiple suits. The fit runs true to size for most, with larger swimmers (6’3”, 210 lbs) needing the X-large for a secure feel.

User feedback is overwhelmingly positive for the value proposition. Reviewers note the suits feel safe and secure in the water, with no bunching or sagging. The black color is more modest than lighter options, and the overall design is simple and functional. If you’re a regular lap swimmer on a tight budget, this pack lets you throw a fresh pair into your bag every week without worrying about wear and tear. For the price per suit, it’s hard to beat.

Why it’s great

  • Three-pair pack provides rotation for frequent training
  • Compression fit supports muscles and reduces drag
  • Easy entry point for swimmers new to jammers

Good to know

  • Each pair lasts about 3–4 months of heavy lap use
  • Not as durable as higher-end single suits
Tall Fit

6. HODOSPORTS Mens Swimsuit Trunks 9″ Quick Dry Swim Shorts

9″ InseamBike Liner

HODOSPORTS built these 9-inch trunks specifically for swimmers who need extra length. The longer inseam provides full thigh coverage without excess bagginess, making them an excellent choice for tall men or anyone who prefers a modest cut. The built-in compression liner is a bike short style — not mesh — which prevents chafing and provides soft support through long sessions. The outer fabric is lightweight and quick-drying, and reviewers note it doesn’t cling or balloon when wet, a common complaint with looser board shorts.

The material holds its shape and color after multiple washes, a testament to the quality of the polyester-spandex blend. The trunks feature two side pockets and a back zipper pocket, though the side pockets are mesh-lined for drainage. The waistband uses a flat drawstring that lies smooth against the skin, preventing irritation under a wetsuit or rash guard. Some users report the fit is slightly relaxed compared to compression-focused shorts, which is ideal for casual swimming, beach days, or walking around the pool deck.

Reviewers consistently highlight the lack of ride-up — the bike liner and longer inseam keep everything in place, even during active movement. One taller swimmer (205 lbs, size L) said the trunks fit perfectly with no awkward bunching. The availability of matching boys’ trunks is a thoughtful addition for parents who want to match with their kids. These are less performance-oriented than a jammer but deliver excellent all-day comfort for training sessions, coaching, or family swims.

Why it’s great

  • 9-inch inseam is ideal for tall builds and maximum coverage
  • Bike short liner prevents chafing and ride-up
  • Holds shape and color after repeated washing

Good to know

  • Relaxed fit may feel less secure for high-intensity lap work
  • Mesh side pockets can let small items fall through
Budget Pick

7. SILKWORLD Mens Swim Trunks Quick Dry Bathing Suit

9″ InseamZipper Pocket

The SILKWORLD trunks offer a straightforward entry point into quick-dry swimwear without any frills. With a 9-inch inseam, built-in compression liner, and zippered pockets, they check the essential boxes for training and casual swimming. The liner is a spandex short — not mesh — which is a welcome feature at this price point. Reviewers report the fit runs true to size, the material dries fast, and the color options are accurate to the listing. For someone looking for a functional, low-investment pair of trunks, this gets the job done.

The fabric quality is adequate for occasional use but may wear faster under daily chlorine exposure. One reviewer described the fabric as “not high quality, but ok,” which matches the expectations for an entry-level short. The zippered back pocket is a practical addition for securing a phone or key card while walking the boardwalk or pool deck. The lack of a net lining is a major plus — the built-in liner provides support without the uncomfortable mesh that chafes during repetitive movement.

Most buyers are satisfied with the value, especially given the competitive price. A few swimmers wished for a longer inseam (10 or 11 inches), suggesting that the 9-inch length may feel short for very tall users. Perfect for a vacation pool or occasional lap sessions, but not designed for the rigors of daily competitive training. If you’re budget-conscious and need a pair of trunks that dries fast and fits well, this is a solid choice.

Why it’s great

  • Built-in spandex liner is more comfortable than mesh netting
  • Zippered pocket offers secure storage for essentials
  • Quick-dry material works well for casual swimming

Good to know

  • Fabric quality is adequate but not premium
  • 9-inch inseam may feel short for very tall swimmers

FAQ

What is the best inseam length for lap swimming?
For lap swimming, a 5-inch to 7-inch inseam is ideal because it reduces drag and allows unrestricted leg motion for a powerful kick. Longer 9-inch inseams provide more coverage but increase water resistance. If you are primarily training in a pool, stick to shorter inseams for better performance.
Do training swim shorts need a compression liner?
Yes, a built-in compression liner is strongly recommended for training. It prevents chafing, supports the muscles, and keeps the shorts from riding up during flip turns and kick sets. Avoid trunks with loose mesh netting, which causes discomfort and bunching during extended swim sessions.

Final Thoughts: The Verdict

For most users, the swimming shorts for training winner is the Speedo Guard Volley because it combines lifeguard-level durability with a lightweight, low-drag cut that works for coaching, lap swimming, and all-day wear. If you want a fitted 5-inch training short with a superior compression liner, grab the maamgic 5″ Trunks. And for the best value on a multi-pack rotation, nothing beats the KANAV 3-Pack Jammers.

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