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Original 100 Year Sweatpants. Black edition
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Original 100 Year Sweatpants. Black edition

Weatherproof sweatpants that keep out fire, wind, snow and cold.
Sale price  $270 Regular price  $675 60% off
Model is 6ft 2 / 188cm with a 32 inch / 81cm waist, and wears size Medium.
  • Designed to look and feel like normal sweatpants
  • They repel rain, wind, snow and fire
  • Soft, engineered fleece inside

After spending two years in R&D rebuilding our 100 Year Hoodie to combat fire, rain, wind, snow and cold, we decided to take the same technology and use it to make a pair of weatherproof sweatpants.

While the 100 Year Sweatpants look and feel like a normal pair of sweatpants, they’re infinitely tougher, as they’re built from a material that started life in a warzone. Constructed from a three-layered fabric originally developed for the elite military, every pair is milled in the US before being manufactured at one of the most technologically advanced factories in the world.

With a soft, warm, engineered fleece next to your skin, water repellent membrane and fire repellent outer shell, these warm winter sweatpants are designed to last for the rest of your life.

Technical details

Material made in the US by Polartec
Highly abrasion resistant
The outside of the pants is water repellent and fire resistant
Built with a breathable waterproof membrane
Underside of the pants is an engineered fleece
High wicking
Four way stretch throughout
Zip fly
2 large front pockets
2 large angled back pockets with rubberised waterproof zippers
Drawcord waist
Cool wash max temp 40°C
Constructed in Lithuania
Material made in the US by Polartec
Highly abrasion resistant
The outside of the pants is water repellent and fire resistant
Built with a breathable waterproof membrane
Underside of the pants is an engineered fleece
High wicking
Four way stretch throughout
Zip fly
2 large front pockets
2 large angled back pockets with rubberised waterproof zippers
Drawcord waist
Cool wash max temp 40°C
Constructed in Lithuania
01 | 03
Designed for an unpredictable world

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.

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.
Built with Polartec technologies

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.

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.

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.

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.

SIze + Fit

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.

Size XS S M L XL XXL
Fits waist 71 - 76 76 - 81 81 - 86 86 - 91 91 - 96 96 - 101
Outside leg 101 102.5 103 104.5 106 107.5
Size XS S M L XL XXL
Fits waist 28 - 30 30 - 32 32 - 34 34 - 36 36 - 38 38 - 40
Outside leg 40 40.5 40.5 41 41.5 42.5