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Product guide

Arena Men’s Dynamo R Swim Brief, 5.5 cm

Arena Dynamo R swim briefs combine a 4-way-stretch recycled-polyamide fabric with an adjustable internal drawstring and soft front lining. The listing gives two different side lengths, so confirm which cut applies to the selected item before buying.

At a glance

  • The manufacturer describes MaxFit Eco as a stretchy, recycled-polyamide fabric intended for pool, beach and other water use.
  • An internal drawstring lets the wearer adjust the fit, and a soft front lining is specified.
  • Fabric is listed with integrated UPF 50+ UV protection and chlorine and saltwater resistance.
Price
$21.88Save 29%

Reference price: $30.73

Price checked: 13 Nov 2026

View offer

Pros and cons

Pros

  • The drawstring allows fit adjustment, while the four-way stretch is intended to support movement in the water.
  • The listed recycled-polyamide fabric combines chlorine and saltwater resistance with integrated UPF 50+ protection.

Technical specifications

11 specifications
Identity
BrandArena
Model006491
DepartmentMen's
Fabric and fit
FabricMaxFit Eco
Fabric compositionrecycled polyamide
Stretch4-way stretch
Side length in description7 cm
Adjustable waistadjustable internal drawstring
Liningsoft front lining
Protection and resistance
UV protectionUPF 50+
Water resistance claimChlorine and saltwater-resistant

What to know before buying

Listing details to confirm

The title states a 5.5 cm brief, while the description specifies a 7 cm side length. These listing details are inconsistent, so confirm the cut for the selected item. Customer feedback also reports mixed fit and comfort, with some finding the front tight and sizing small.

Who is it for?

A good fit for

  • Swimmers seeking a brief with an adjustable internal drawstring and soft front lining.
  • Pool or beach users who want the listed stretch fabric and UPF 50+ protection.

Less suited to

  • Buyers who need a confirmed side length or a predictably generous fit without checking the listing and size guidance.
Arena Men’s Dynamo R Swim Brief, 5.5 cm · photo 2
Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 273 ratings
  • 5 stars68%68%
  • 4 stars17%17%
  • 3 stars7%7%
  • 2 stars1%1%
  • 1 star7%7%

Customer feedback describes the briefs as good quality and attractive, but reports mixed fit and comfort. Some find the front tight, and sizing is said to run small. That matters for a close-fitting brief, especially since the listed side length is inconsistent. The aggregate ratings are generally positive but include a range of opinions, and ratings alone do not explain why customers responded as they did.

Positive themes

  • Customers report good quality and like the design.

Negative themes

  • Some customers say the sizing runs small.

Mixed feedback

  • Fit opinions vary, including reports of tightness at the front.
  • Comfort feedback is divided.

Frequently asked questions

What side length does the brief have?

The title specifies 5.5 cm, while the description says 7 cm. Confirm the selected listing's measurement before buying.

What fabric and protection are listed?

The description names MaxFit Eco recycled-polyamide fabric with four-way stretch, chlorine and saltwater resistance, and integrated UPF 50+ protection.

How is the fit adjusted?

An adjustable internal drawstring is listed. Customer feedback on fit and comfort is mixed, and some customers say the sizing runs small.

Arena Men’s Dynamo R Swim Brief, 5.5 cm · photo 3
Additional product photo 3

Alternative options

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Product details in Markdown