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Zenith is a unique high performance climbing rubber compound developed by Boreal. This compound provides outstanding friction and excellent hold on small edges.

Zenith rubber is a high performance rubber developed by Boreal. Zenith is designed for no-compromise performance, and features incredible friction properties combined with an ability to hold micro edges. This ultimate compound is featured on our highest performance rock shoe models. 


Lateral Torsion System
The Lateral Torsion System is the latest development in rand tensioning technology. A tensioning band is used in conjunction with varying rubber thickness to produce a highly supportive yet supple hold on the foot.

At the heart of the Lateral Torsion System is a tensioned band running around the heel and under the instep. This band provides both high levels of support to the foot while standing on smaller holds, and excellent heel fit. However the Lateral Torsion System does not stop there; by utilising thinner rubber in key areas, the flexibility of the shoe can also be enhanced. This combination provides the ultimate balance between support and sensitivity, ideal of any high performance bouldering shoe.

Friction Skin
Friction Skin is the name given to our special coating designed to enhance friction on the top of the shoe. Granules of our ultra sticky Zenith rubber are combined with a durable glue to create a thin and supple rubber layer over the toes.

Traditionally, shoes designed with toe-hooking in mind have used thin sections of sheet rubber over the toes. While this increased friction, it was at the expense of reduced comfort and sensitivity. To address this issue, Boreal developed Friction Skin.

This coating comprises granules of our highly acclaimed Zenith rubber mixed with high quality glue. The coating is durable, flexible and thin, acting like a second skin and still allowing the shoe upper to mold around the contours of the toes. This results in superb toe-hooking ability without compromising the comfort and sensitivity of the shoe.

Ref. 11935 MUTANT

To climb the hardest routes and boulders, a shoe must excel in all areas; to find friction wherever it appears. Edges, smears, heel and toe hooks; any of these may be needed to ensure a successful ascent.  With the Boreal Mutant, there is no compromise.

Product Info
  • UPPERS: High quality split leather. Elastic and strap footwrap closure system. Extra thin rubber zone over the toes for grip and protection.

  • LINING: No.

    ​WEIGHT: ​460 grs./pair (size 6 UK)
  • MIDSOLE: Special anti-deformation midsole.

    CONSTRUCTION: Slip-Lasted.

  • SOLE: Ultra sticky Boreal ZENITH outsole.4-4.5mm thickness depending on size.

  • CHARACTERISTICS: High performance strap slipper hybrid. Outstanding performance on extreme moves like toe and heel hooking thanks to its innovative rubber toe patch and outstanding heel. Great edging performance and sensitivity.

  • USAGE: High performance shoe which excels at bouldering or sport climbing.

    460 gr. pair. Size 6 U.K.


  • The Mutant features a highly asymmetric and downturned last to optimally position the foot on steep rock. The highly advanced sole unit comprises a super-sticky molded Zenith™ rubber forefoot half-sole and one-piece Zenith™ heel cup. These molded sections have an accurate 3D shape to hold the foot with no dead space, and maintain their shape over time. 
    Thinner rubber is used in the middle of the sole to enhance flexibility, and ensure a close fit under the arch. The Lateral Torsion System, a band running around the heel and under the foot, securely holds the foot in place aiding power transmission across the shoe.

  • The premium quality unlined leather upper features our new “Friction Skin” coating for ultimate toe-hooking ability without the pain of a rubber toe covering and the simple elastic and single strap closure system ensures a comfortable, low profile fit. 
    The Mutant is the ideal choice for boulderers, competition climbers and sport climbers operating at higher grades or on steeper rock. 

Boreal Outdoor
Edges, smears, heel and toe hooks; any of these may be needed to ensure a successful ascent. With the BOREAL Mutant, there is no compromise