Technical details
Open Accordion
Size + fit
Open Accordion

Fit guide: The 100 Year Sweatpants are designed with a regular fit, but run a couple of centimetres shorter than our Planet Earth Pants and 100 Year Pants.

Model wears: Skier, snowboarder and surfer Will Higginson is 6ft 2 / 188cm with a 32in / 81cm waist. Will wears the 100 Year Sweatpants in size Medium.

Personalised advice: See our size guide for more advice on sizing, or you can ask us for personalised sizing advice here.

Returns and exchanges: Don’t worry if you order something and it doesn’t fit – we have a free, no hassle 30 day return and exchange period.

Fits waist71-7676-8181-8686-9191-9696-101
Outside length101102.5103104.5106107.5
Fits waist28-3030-3232-3434-3636-3838-40
Outside length4040.540.54141.542.5
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100 Year Sweatpants

The next 100 years won’t look like the last 100

As floods and fires sweep across entire countries, we’re radically underprepared as a species for the speed at which change is taking place. But while we’re entering a new normality, we’re not about to suddenly evolve the ability to resist fire or live back in the oceans. So our survival systems need to adapt – from emergency planning and infrastructure, to our architecture and clothing. Of all of these clothing is going to be the fastest.

100 Year Sweatpants

Designed for an unpredictable world

It used to be just adventurers or the elite military who would be exposed to perpetual threat. But as risk becomes more commonplace, the clothes on your back need to do more. They still need to be soft, comfortable and warm, but they should be designed with extreme performance capabilities. So all our 100 Year gear is made from materials with properties that normal clothing simply doesn’t have. They’re built to cope with whatever the next century holds.

100 Year Sweatpants

Wear them like your regular sweatpants

The idea for the 100 Year Sweatpants was always to make them look and feel like any other sweatpants. So they’re designed to have a loose relaxed feel. And the inside of the pants is a warm, cushioned fleece. The pants have four large, super-practical pockets for carrying extra gear. There are two large front pockets, and two more at the back. The zippers are all rubberised and waterproof. There’s a zipped front fly, and a drawcord waist with heat-moulded rubberised ends.

100 Year Sweatpants

The pants are made from three layers sandwiched together

If you looked at a cross section of the pants, you'd think you’re just looking at a single layer of fabric. But just as you’d find with any high-performance jacket, it’s actually three separate layers sandwiched together and performing three distinct roles. The outer layer is a stretchy, fireproof and windproof softshell. The middle layer is a waterproof membrane. And the bottom layer next to your skin is a soft, engineered fleece that keeps you warm, dry and comfortable.

The outside layer is fire repellent

Even on its own the outer layer of the pants would be one of the toughest pieces of clothing you’ve ever worn. Highly durable and abrasion resistant, it’s also fire repellent. Yet despite this it doesn’t feel like any fire-resistant fabric that’s ever been made before. And that’s because the two layers beneath it help turn it into a pair of sweatpants comfortable enough to spend the rest of your life in.

The middle layer keeps out rain and wind

Sweatpants don’t normally come with membranes. You usually only find them in high performance outdoor jackets. But these are 100 Year Sweatpants, so they have one. And just like any good ski jacket or running jacket, the membrane is there to keep the rain and wind out, while letting excess heat and sweat escape easily.

100 Year Sweatpants

An engineered fleece sits next to your skin

The inside of the pants is made from an engineered fleece. And it’s this inner layer that provides the warmth and comfort you want from any sweatpants. The fleece is built with a grid structure which creates thousands of tiny air channels. These are designed to increase breathability and trap warmth, while subtly decreasing the mass and weight of the pants. The fleece is also hydrophilic, so it rapidly absorbs sweat and transfers it to the outside of the pants.

100 Year Sweatpants

Built with Polartec technologies

As well as being synonymous with outdoor gear, for the last decade Polartec have been developing flame resistant fabrics for the US military after their uniforms began melting in the intense heat of IED detonations. They work with military partners to develop combat-ready layering systems that protect soldiers from sudden heat sources in hostile territories. Our aim was to let anyone benefit from this technology. So we worked with Polartec to rebuild our 100 Year Hoodie from scratch, then we used the same technology to make these pants.

100 Year Sweatpants

How it fights sudden fire

The material the 100 Year Sweatpants is built from is designed to protect you in the most dangerous situations, from flash fires to arc flash. A flash fire is a sudden, intense fire that combines high temperatures and short duration with a rapidly moving flame front. An arc flash is a type of extreme electrical explosion that’s capable of generating temperatures of 19,400°C, which is four times hotter than the surface of the sun and can burn skin and set clothes on fire even at a distance.

100 Year Sweatpants

Built for the harshest environments on Earth

Whether you’re taking on a mountain or the whole of Netflix, you’re going to need some really warm, comfortable pants to wear. Sweatpants are not normally known for toughness, waterproofness, or breathability. But all our 100 Year gear is made with materials that have the kind of properties normal materials simply don’t have, and the 100 Year Sweatpants are no different. So while these are the toughest and most weatherproof sweatpants ever created, they’re also perfect to sit back and relax in.

100 Year Sweatpants

The sweatpants are part of our 100 Year range

Our 100 Year gear has always been built to be highly resistant to things like fire, time, water and abrasion. Our 100 Year Jacket is the most waterproof jacket on Earth. Our 100 Year Pants are made from a material so tough it was originally built to enable the military to walk through burning buildings. And our 100 Year Vest is the ultimate utility vest – fireproof, water repellent, and with enough pockets to carry your life with you. Worn together this system will protect against almost anything.

  • esquire-final

    Vollebak aims to do for outdoor clothing what Tesla did for cars and El Bulli did for food, using science, wit and imagination to create products no-one thought possible.

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