arena Dynamo R Men’s Swim Briefs, 5.5 cm Side Length

Side Length: The arena Dynamo R men’s swim briefs use MaxFit fabric with four-way stretch and a classic, sporty cut. The listing claims chlorine and salt resistance and UPF 50+ protection, with a soft front lining and adjustable inner drawstring.

At a glance

Four-way stretch is intended to support movement and a close, comfortable fit for swimming and other aquatic activities.
The fabric is described as chlorine- and salt-resistant, for pool or sea use.
A soft front lining and adjustable inner drawstring add coverage and fit adjustment.
The listing describes the MaxFit fabric as an evolution of arena MaxFit and made with recycled polyamide.

Price

$24.25Save 17%

Reference price: ~~$29.37~~

Price checked: 13 Nov 2026

View offer

Pros and cons

Pros

Adjustable inner drawstring lets the wearer fine-tune the fit.
Suitable for pool, sea and aquatic activities according to the listing.
Front lining is included in the described design.

Technical specifications

13 specifications

Identity
Brand	arena
Model	006491
Department	Men's

Fabric and fit
Fabric	MaxFit fabric
Fabric composition note	made of recycled polyamide
Stretch	4-way stretch
Side length	5.5cm
Cut	classic cut
Lining	soft front lining
Waist adjustment	adjustable inner drawstring

Protection and resistance
Chlorine and salt resistance	Chlorine- and salt-resistant
UV protection	UPF 50+ UV protection
Textile label	OEKO-TEX STANDARD 100

What to know before buying

Customer feedback reports mixed sizing, with some customers saying the briefs run very small. Check the size chart carefully before choosing a size.
The listing says every component of fabrics bearing the OEKO-TEX STANDARD 100 label has been tested for harmful substances. This is a stated textile-label claim, not an independent product assessment.

Who is it for?

A good fit for

Swimmers wanting a classic-cut brief with an adjustable inner drawstring.
Pool or sea swimmers looking for a suit described as chlorine- and salt-resistant.
Buyers who prefer a lined brief with four-way stretch.

Less suited to

Shoppers who prefer longer-leg swimwear or do not want a brief-style cut.
Buyers who need sizing certainty without checking measurements, given the reported mixed sizing feedback.

arena Dynamo R Men’s Swim Briefs, 5.5 cm Side Length · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 397 ratings

5 stars66%66%
4 stars16%16%
3 stars9%9%
2 stars3%3%
1 star6%6%

Customer feedback highlights fit and quality as strengths, while sizing receives mixed feedback and some customers say the briefs run very small. These reports matter when choosing a close-fitting brief, so compare measurements with the size chart. Most ratings are five-star, but the overall distribution also includes lower ratings and does not establish why customers rated the product as they did.

Positive themes

Customers report good fit.
Customers appreciate the quality.

Negative themes

Some customers say the swimsuit runs very small.

Mixed feedback

Sizing feedback is mixed.

Frequently asked questions

What is the side length of the arena Dynamo R briefs?

The listing gives a side length of 5.5cm.

What features help adjust the fit?

The briefs have four-way stretch and an adjustable inner drawstring. Customer feedback on sizing is mixed, so check the size chart before ordering.

Are these briefs described for pool and sea use?

Yes. The listing describes the MaxFit fabric as chlorine- and salt-resistant and says the briefs are suitable for pool, sea and other aquatic activities.

What protection claims does the listing make?

It states UPF 50+ UV protection and describes the fabric as chlorine- and salt-resistant.