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The Boreal Siula is a waterproof, lightweight double boot consisting of an outer boot and a removable inner boot. The Boreal Siula is suitable for intense to extremely cold conditions, high mountain and altitude climbing and long winter alpine ascents.  The outer boot has an integral gaiter constructed from two materials. The inner portion of gaiter in extra abrasion resistant material with waterproof membrane. The outer portion of gaiter in abrasion resistant and highly breathable material with Sympatex® membrane. The shell is waterproof and reinforced one piece. Highly abrasion resistant Cordura liner with membrane and a thick insulation.Both the inner and outer boot have an anti-slip heel lug to assure a precise inner boot location and secure hold on the outside.  Finally, for superior torsion control, the midsole has added lateral reinforcements. Construction consists of liner, shell and integrated gaiter Waterproof Thermally insulating Highly abrasion resistant Liner with Thermal Layer System of Dry Line®, Thinsulate, Sympatex®, Codrira® Thermally welded seams of the liner Non-slip sole made of neoprene Contoured, padded tongue Waterproof, insulated and robust shell of 2.8 mm leather without seams Multilayer shell lining with Cordura®, Sympatex®, EVA, PES foam Reinforced instep zone Insulating and stabilizing XTP insole PBG-680 Stable, crampon-compatible sole construction Grippy Virbram® Teton outsole Crampon compatible: automatic;  TPU heel and toe piece   Last: Unisex | Category: D | Weight: 2,540 g (pair, UK 7) | Upper: polyester, polyamide, polyethylene, EVA | Lining: polyester, polyamide, EVA, chloroprene rubber | Sole: polyurethane, EVA, rubber
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In stock,
delivery time 3-5 days
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Show Product Numbers
UK6:
3002270-002
UK6.5:
3002270-003
UK7:
3002270-004
UK7.5:
3002270-005
UK8:
3002270-006
UK8.5:
3002270-007
UK9:
3002270-008
UK9.5:
3002270-009
UK10:
3002270-010
UK10.5:
3002270-011
UK11:
3002270-012
UK11.5:
3002270-013
UK12:
3002270-014
UK12.5:
3002270-015

Boreal - Shoes - Unisex

EUUKUSInstep circumference (cm)Foot length (cm)
34,32-22,921,4
34,92,5-23,321,8
35,63-23,722,2
36,23,5-24,122,6
36,84-24,623,1
37,54,5-25,023,5
38,15-25,423,9
38,75,5-25,824,3
39,46-26,224,7
40,06,5-26,725,2
40,67-27,125,6
41,37,5-27,526,0
41,98-27,926,4
42,58,5-28,426,9
43,29-28,827,3
43,89,5-29,227,7
44,510-29,628,1
45,110,5-30,128,6
45,711-30,529,0
46,411,5-30,929,4
47,012-31,329,8
47,612,5-31,830,3
48,313-32,230,7
48,913,5-32,631,1
49,514-33,031,5

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Product description

The Boreal Siula is a waterproof, lightweight double boot consisting of an outer boot and a removable inner boot. The Boreal Siula is suitable for intense to extremely cold conditions, high mountain and altitude climbing and long winter alpine ascents. The outer boot has an integral gaiter constructed from two materials. The inner portion of gaiter in extra abrasion resistant material with waterproof membrane. The outer portion of gaiter in abrasion resistant and highly breathable material with Sympatex® membrane. The shell is waterproof and reinforced one piece. Highly abrasion resistant Cordura liner with membrane and a thick insulation.Both the inner and outer boot have an anti-slip heel lug to assure a precise inner boot location and secure hold on the outside. Finally, for superior torsion control, the midsole has added lateral reinforcements.


  • Construction consists of liner, shell and integrated gaiter
  • Waterproof
  • Thermally insulating
  • Highly abrasion resistant
  • Liner with Thermal Layer System of Dry Line®, Thinsulate, Sympatex®, Codrira®
  • Thermally welded seams of the liner
  • Non-slip sole made of neoprene
  • Contoured, padded tongue
  • Waterproof, insulated and robust shell of 2.8 mm leather without seams
  • Multilayer shell lining with Cordura®, Sympatex®, EVA, PES foam
  • Reinforced instep zone
  • Insulating and stabilizing XTP insole PBG-680
  • Stable, crampon-compatible sole construction
  • Grippy Virbram® Teton outsole
  • Crampon compatible: automatic; TPU heel and toe piece 

Last: Unisex | Category: D | Weight: 2,540 g (pair, UK 7) | Upper: polyester, polyamide, polyethylene, EVA | Lining: polyester, polyamide, EVA, chloroprene rubber | Sole: polyurethane, EVA, rubber

Product features
Recommended use
  • mountaineering
  • expedition
Suitable for
men, women
Features
removable inner shoe lining, waterproof, , integrated gaiters
Construction
  • D category
  • crampon automatic
  • Vibram®
Fit
Features
Laced , velcro fastener, zip closure, leg-end with drawstring
Weight
2580
production
vegan produced
material
  • Shoe material upper polyester, polyamide, EVA
  • Shoe lining material polyester, polyamide, eva, chloroprene rubber
  • Shoe sole material rubber, polyurethane, carbon, EVA
Special product features
100% vegan 100% vegan
100% vegan produced

Products labelled with "100% vegan" entirely dispense with the use of animals or animal ingredient origins (such as leather or down).

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all vegan outdoor products
Made in Europe Made in Europe
Made in Europe

Production in Europe ensures the fulfillment of European standards in regard to environmental and sustainability issues as well as labour conditions

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all „made in Europe“ outdoor products
Vibram® Vibram®
Vibram®

Vibram rubber outsoles have provided traction for over 75 years. The Italian company has long been the go-to outsole choice for running, trekking, climbing and leisure shoes.

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all shoes with Vibram® sole
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