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Heel Fit System
The Heel Fit System (HFS) consists of anatomically sculpted pieces of foam padding which hold the heel comfortably and securely in place to avoid unwanted movement.

Trekking boots require a snug fit around the heel area to prevent unwanted movement which can lead to excessive friction and blisters. HFS is a system of anatomically shaped high quality foam padding which helps to comfortably hold the heel securely whilst accommodating different heel shapes.

Ref. 11406 SILEX LACE
Silex Lace
The Silex has long been established as the go-to shoe routes shoe, and the latest updates ensure it maintains this status. Silex offers a perfect blend of fit, support and precision making it ideal for those operating in the mid grades to push their skills without sacrificing comfort.
Product Info
  • UPPERS: Split leather with recycled AirNet panels for increased ventilation. Lace closure for a precise yet comfortable fit.
  • LINING: 3D recycled lining for more breathability and comfort.
  • MIDSOLE: Special anti-deformation recycled midsole.
  • SOLE: Sticky yet durable Boreal ZENITH Quattro outsole. 4-4.5 mm thickness depending on size. Central part of the outsole with recycled rubber.
  • CHARACTERISTICS: A stiff and supportive shoe with superior comfort and breathability. Lace closure provides a precise and tunable fit.

    CONSTRUCTION: Slip-Lasted
  • USAGE: Designed for day long use indoors or outdoors. Perfect for long crag days, multi-pitch climbs and extended training sessions.

    WEIGHT: 590 gr. pair. Size 7 U.K.


  • Silex is constructed from a premium quality split leather upper and a fast yet secure speed lace closure. Lacing extends fully to the toe to help accommodate a wide variety of foot shapes.The flat lasted shoe incorporates a stiff midsole with concaved forefoot, enhancing support and placing the toes into a more powerful position. 

  • The sole unit features a large section of our recycled Eco rubber, while sticky Zenith Quattro is used in the climbing zones at forefoot and heel.
    Silex is the perfect choice for those looking to step up their route climbing performance, without sacrificing all-day comfort.