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Bi-Flex

Bi-Flex is a system developed by Boreal to improve the forward and lateral flexibility of mountain boots around the ankle area. Bi-Flex greatly enhances both the walking comfort and freedom of movement when climbing.


Mountain boots with uppers made from stiff materials can restrict the natural articulation of the ankle joint causing discomfort when walking and restricting the freedom of movement when climbing. 

Bi-Flex eliminates this problem by carefully positioning panels of soft pliable materials in specific areas of the upper. These soft compressible panels act like hinges to allow the natural articulation of the ankle in both the lateral and fore/aft directions. Hard incompressible components such as lace eyelets are either made from soft textile materials instead or repositioned so as to not cause pressure points or impede articulation. Bi-Flex greatly enhancing the ergonomics and comfort of high ankle mountain boots.

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Thermal Layer System

A thermal insulation system using Thinsulate® to completely surround the foot with no cold spots. The Thinsulate® lining is fixed in place with minimal use of adhesives to maximize loft. The base of the boot is uniquely insulated with triple Thinsulate® to minimize heat loss through the sole unit.

TLS is a thermal insulation lining system which uses layers of Thinsulate® to completely surround the foot without cold spots. The Thinsulate® lining is fixed in place with minimal use of adhesives to maximize the loft and warmth of the lining. The floor of the boot is also insulated with a triple Thinsulate® layer to insulate the floor of the boot from conductive heat loss to the ground, especially important when crampons are fitted. This full Thinsulate® lining which extends underfoot gives Boreal mountain boots a significant warmth advantage.

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XTP Footbed

The Extreme Thermal Protection footbed has superior thermal insulation performance to help protect against extreme cold. XTP is used on our Mountaineering and Expedition boots.


The XTP (extreme thermal protection) is a special footbed with superior thermal insulation. The XTP footbed is made from a combination of a highly isolative felt material and a memory foam layer for superb underfoot comfort. XTP can be found in our Expedition and Mountaineering boots where it helps to protect against extreme cold.

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Ref. 47449 G1 LITE
G1 Lite

For 2015 we have further enhanced our most popular double boot, taking comfort and performance to another level. Careful selection of the best modern materials has enabled us to reduce weight without compromising warmth. G1 Lite is truly a modern classic for winter alpine ascents and 6000m peaks.

Product Info
  • UPPERS: Double boot with an outer shell and removable inner bootie

  • OUTER BOOT: Lightweight, highly abrasion resistant and water-resistant Teramida with Lorica and ceramic reinforced stretch Cordura. Bi-flex system for superior ankle articulation and comfort. 6mm EVA insulation layer and Cordura-Sympatex waterproof breathable lining. 1.4mm neoprene insole for insulation. Integral elasticated snow skirt. Lightweight TPU rand for durability

  • INNER BOOT: Bootie made from very lightweight and extremely insulative triple layer laminate. A heat reflective aluminium film is bonded to a durable polyurethane outer layer and insulative EVA foam on the internal side. Boreal Dry-Line® waterproof breathable lining with fully thermosealed seams. Triple Thinsulate®layers (no adhesives used) suround the foot guaranteeing maximum thermal protection with no cold spots. The sole of the bootie is covered with a durable textured TPU surface. Easy adjust 'Tanka' and strap closure system with adjustable fit around the instep area

  • MIDSOLE: Ultralight Boreal PBG-680 carbon composite midsole with lateral torsion control. Unique Thinsulate lining for superior underfoot thermal insulation

  • SOLE: Vibram Teton rubber outsole with dual density EVA and PU shock absorbing layers. Differential hardness TPU toe and heel pieces for automatic crampons

  • USAGE: High altitude mountaineering. Long winter alpine ascents

    WEIGHT: 2290 grs./pair (size 7 UK)

Features

  • The upper is made from lightweight synthetic textiles and unlike plastic shelled boots it is soft and articulated making it much more comfortable to wear. A soft elasticated snow cuff fits snugly around the leg to keep the snow out. Inside the upper is lined with a tough and waterproof breathable Cordura reinforced laminate. Sandwiched between these layers is 6mm of EVA foam for superb thermal insulation and the new synthetic rand material is lighter and warmer than rubber and won’t perish in the high U.V light conditions found at high altitude. The all new inner bootie is made from a very lightweight and extremely warm triple layer laminate material comprising of an outer polyurethane layer, heat reflecting aluminium film and an inner layer of insulating EVA foam.

     
  •  Triple Thinsulate™ layers fully surround the foot providing yet more insulation with no cold spots and a fully waterproof breathable Boreal Dry-Line® lining guarantees to keep your feet dry. The ‘Tanka’ and strap closure is easy to use and is adjustable around the instep area for a custom fit. G1 Lite is fully compatible with automatic crampons and uses dual density crampon lugs, hard at the rear for a secure fit and soft at the front for reducing vibration when frontpointing on bullet hard ice.  The advanced carbon composite midsole is rigid, yet incredibly lightweight and ample underfoot cushioning is provided by dual density shock absorbing PU and EVA layers. Finally, our choice of a deeply lugged Vibram® Teton outsole will help keep you upright on the approach.

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