1 / 7Arena 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.
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| Brand | Arena |
|---|---|
| Model | 006491 |
| Department | Men's |
| Fabric | MaxFit Eco |
|---|---|
| Fabric composition | recycled polyamide |
| Stretch | 4-way stretch |
| Side length in description | 7 cm |
| Adjustable waist | adjustable internal drawstring |
| Lining | soft front lining |
| UV protection | UPF 50+ |
|---|---|
| Water resistance claim | Chlorine 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.

Customer reviews on Amazon
- 5 stars
68% 68% - 4 stars
17% 17% - 3 stars
7% 7% - 2 stars
1% 1% - 1 star
7% 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.

Alternative options

Speedo Men's Solar Brief | Summer Style | Beach Wear | 5cm
$28.00

Speedo Men's Endurance+ 7cm Brief

Speedo Men's Endurance+ 5cm Brief
$31.50

Speedo Men's Classic Logo Brief
$29.99

Arena Dynamo R Men's Swimsuit, Quick-Drying Swimsuit, Chlorine and Salt Resistant Maxfit Fabric, UPF 50+ UV Protection
$25.68

Rip Curl Men's Corp Sluggo Brief
$15.59























