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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.

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.

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.


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.


Dry-Line® is much more than a waterproof membrane, it is a unique lining system developed by Boreal with superior performance and reliability. Dry-Line® is exclusive to Boreal.

Dry-Line® is much more than a waterproof membrane, it is a unique lining system developed by Boreal with superior performance and reliability. Dry-Line® is exclusive to Boreal.


Dry-Line® combines the waterproof laminate Sympatex 337 professional (a Sympatex® membrane with breathable micro-fibre lining) and a leather or synthetic outer layer. Between the membrane and lining is an air space created by a monofilament pile layer. Moisture vapor inside the boot enters this air space and is ‘pumped’ out of the boot during normal walking action. This vertical chimney like movement of water vapor is a key part of what makes Dry-Line® superior to other membrane systems.

Regular membrane systems can usually only attempt to breathe horizontally through the upper materials of the boot. In most boots this horizontal breathability is severely restricted by layers of leather, synthetic reinforcements, glue and rubber pieces which all combine to greatly impede the transmission of moisture vapor. 

Thanks to the unique structure of Dry-Line® Boreal boots are able to breathe both horizontally and vertically.


The Sympatex® membrane used in Dry-Line® is a polyether/ester copolymer membrane. Unlike microporous membranes this membrane has no pores to clog, so its performance does not deteriorate with use. It is also much more elastic than other membranes making Dry-Line® far less prone to puncture damage, consequently Dry-line® lined boots have much better long-term reliability and durability than those with other lining systems. Sympatex® is halogen and solvent free and is fully recyclable making it the most eco-friendly membrane on the market.

Ref. 47377 ARWA
Arwa is an alpine mountaineering boot made with the very best modern materials and a fit honed by extensive testing with a team of leading alpinists. The result is a precise, warm, comfortable and lightweight mountain boot which will take you faster and further. A perfect choice for ice/mixed climbing and general alpinism.
Product Info
  • UPPERS: Highly abrasion resistantant, waterproof and reinforced Putek mesh. PVC overlay for added lateral support. Bi-Flex system and HFS padded heel system for a perfect fit. PVC rand for protection. Integrated gaiter
  • LINING: Boreal Dry-Line® XTP for absolute waterproofness and superior breathability. Full internal single layer Thinsulate® lining for thermal protection 
  • MIDSOLE: Boreal PBG-650 with lateral reinforcements for torsion control. Unique triple layer Thinsulate® thermal protection 
  • SOLE: Vibram New Mulaz outsole with dual density, shock absorbing PU and EVA under the heel for comfort. TPU front and heel piece for automatic crampons. Stabilizer TPU piece in metatarsal zone 
  • USAGE: Very cold conditions. Alpine climbing. Technical ice and mixed climbing
  • WEIGHT: 1480 gr. pair. Size 7 U.K.


  • The upper is constructed from lightweight synthetic Putek mesh with a PVC overlay for added lateral support and protection. Arwa has a full Thinsulate™ lining which even extends under the foot to prevent any cold spots.

    Our unique Dry-Line® waterproof breathable lining guarantees to keep your feet dry and has superior water vapour transmission performance.
  • The innovative Bi-Flex system allows the ankle to move freely, greatly enhancing walking comfort and freedom of movement when climbing. The intergated elasticated ankle cuff keeps the snow out and the laces neatly tucked away.
ARWA | An alpine classic
Boreal Outdoor
Designed and crafted in our factory in Spain, perfected by our extensive team of leading Alpinists. Using the best of modern materials, ARWA is precise, warm, comfortable and lightweight.