• Patented double-insulated carbon sole that offers maximum weight reduction and stiffness combined with optimal thermal insulation.
• The BOA® Fit System closure for the inner boot ensures a precise fit and easy opening/closing even with gloved hands
• Removable inner part of the boot
• Waterproof zipper
• Increased rubber protection around the boot
• Rack for spikes at the back and front
• Flexible sock construction
• Vibram Litebase sole
• Easy resoling - it is possible to replace the sole

• Application: Mountaineering, Polar expeditions
• Sole: Vibram® Ascension Expedition Litebase | Thermal insulating carbon insole | Lining: Foil thermal insulation
• Thermal insulation (EN ISO 20334): -35 °C
• Flex index: B3
• Iron compatibility: Automatic C3
• Weight (UK 8.5): 990 g
• Base material: textile, PU protection

• Fair Wear. Fair Wear works to ensure fair and safe working conditions in garment factories. The non-profit organization works directly with factories, unions, NGOs and governments to protect workers' rights.
• DWR without PFC. (Durable Water Repellent) water-repellent treatment without PFC. Perfluorinated compounds (PFCs) are often used for waterproofing, but they are virtually non-biodegradable. Mammut is committed to replacing non-biodegradable fabric processing with more sustainable, high-performance alternatives.

The dimensions specified by each manufacturer may vary.

A size chart developed specifically for Mammut shoes is available here, where the dimensions are decoded in millimeters.

To accurately determine the required size, we recommend measuring the length of the leg in millimeters.

1. Stand against a wall or other 90-degree vertical plane on the floor with your full weight, heel touching the wall/plane.
2. Mark where the thumb ends.
3. Measure both feet . If your feet are different sizes, choose the larger foot size when sizing.
4. See the table below.

For hiking shoes, we recommend buying a shoe at least 1 - 1.5 sizes larger than your everyday shoe size.

In hiking shoes, the toes must not touch the toe!

This is because after walking for a long time, your feet will swell and an otherwise good size shoe will start to feel tight! This is the most common cause of sore feet and toes. In more serious cases, it is even possible to lose toenails due to an inappropriate hiking shoe size.

Example : Measured foot size in millimeters 250 mm or EU 40. Hiking shoes should be chosen from 260 mm or EU 41 1/3.

Size chart EU Size Millimeters UK size 37 1/3 230 4.5 38 235 5 38 2/3 240 5.5 39 1/3 245 6 40 250 6.5 40 2/3 255 7 41 1/3 260 7.5 42 265 8 42 2/3 270 8.5 43 1/3 275 9 44 280 9.5 44 2/3 285 10 45 1/3 290 10.5 46 295 11 46 2/3 300 11.5 47 1/3 305 12 48 310 12.5 48 2/3 315 13 Do Mammut shoes fit the standard EU size? Mammut shoes run small. On average, 0.7 EU sizes smaller compared to other manufacturers' shoes. Mammut EU sizes are converted from Mondo using Mammut's formula, which differs from the standard international system used by most other brands. We invite you to contact us if you have additional questions!