Mares X-Stream Open Heel Fins — Black / Regular

An open-heel fin with a perforated foot pocket

The Mares X-Stream brings together an elastic heel strap, a perforated foot pocket and an Optimized Pivoting Blade design. This listing selects Black in Regular. The open heel and strap allow the fit to be adjusted, while the pocket and blade remain specific to the selected size.

The pocket is part of the design

The perforations are a visible distinguishing feature of the X-Stream. They are part of Mares’ foot-pocket design rather than decorative holes in an otherwise conventional closed pocket. Alongside the elastic strap, the pocket shape is worth checking with the footwear you intend to use.

Regular is the selected manufacturer size label, not a universal promise of fit. If you are buying for an existing pair of boots, use the exact Mares sizing guidance and confirm how the pocket and heel strap sit with those boots.

Blade movement and channels

Mares describes the blade as using Optimized Pivoting Blade technology and a channel-thrust design. These identify the blade’s pivoting arrangement and channels. Look at that blade format alongside the pocket shape when deciding whether the X-Stream fits your equipment and preferences.

Compare the same variant

The retailer offers several color and size combinations under the X-Stream name. This page follows the black Regular selection, including its elastic heel strap. A neighboring size is a different fit even if a listing uses the same product photograph.

Choose the X-Stream if its open-heel arrangement, elastic strap and particular pocket shape suit your equipment. A good purchase decision starts with that fit and the blade format, alongside the pocket and strap arrangement.