We’re sorry we’ve not been able to keep up with demand. The first edition of our 100 Year Pants has sold out in some sizes but you can sign up here to get advance access to the next release

Technical details
Open Accordion
Size + fit
Open Accordion

You just need to know your waist measurement to choose the right size 100 Year Pants. If you’re on the borderline between two waist sizes, we recommend going for the smaller size.

The pants are regular length but there’s some adjustability as you can use the belt tape and press studs to tighten and raise the bottom of each leg.

We shot the 100 Year Pants on trail runner, swimmer and surfer Aljoscha Fábregas who is 6ft 1 with a 31 inch waist and wearing size small.

For more advice on sizing, check our size guide or ask us for help with sizing. And don’t worry if you order something and it doesn’t fit – we have a free, no hassle 30 day return and exchange period.

XSSMLXLXXL
Fits waist71-7676-8181-8686-9191-9696-101
Outside length102103.5105106.5108109.5
XSSMLXLXXL
Fits waist28-3030-3232-3434-3636-3838-40
Outside length4141.54242.54344
100 y kh t crop belt main front 1376

Swiss-engineered material developed for the military

It wasn’t enough for us to build a pair of pants that could simply last for 100 years. We wanted to build a pair comfortable enough to spend the rest of your life in. So we worked with a new, military-grade fireproof fabric engineered in Switzerland that’s built to help soldiers handle the most extreme scenarios, but without having to dress like firefighters. The result is a crazily strong and amazingly comfortable pair of pants that you can wear in any terrain and emerge unscathed.

100 y kh t main crop image 1376

The material is made from three layers sandwiched together

If you looked at a cross section of the pants you'd think you’re just looking at one 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, windproof soft shell. The middle layer is a fireproof coating. And the bottom layer next to your skin is a soft, knitted fireproof fibre that feels like cotton.

100 y kh t main front 3 4 wet 1376

On the outside they feel like sweat pants

Even on its own the outer layer of the pants would make the toughest pair of pants you'd ever worn. Highly durable and abrasion resistant, it’s also water repellent, stretchy and windproof. Yet despite this it’s still super soft and feels nothing like any fire-resistant fabric that’s ever been made before. And that’s because it’s the two layers beneath that turn it from a tough pair of pants to ones that can go through fire.

The middle layer acts like an airbag in a fire

Any contact with fire triggers the fireproof middle layer of the pants. This layer instantly expands to 1000x its size to create a protective barrier between you and the flames. It might sound like an airbag, but it looks more like tiny plants growing at high speed as the protective layer increases in volume and expands to about 6mm in height. This video shows the expansion process. Even if you hold a flame on these pants they can’t catch on fire, and flames simply can’t spread on them.

100 y kh t shoe lace kneel 1376

The pants feel like cotton next to your skin

It’s the inner layer of the pants that keeps them together in an emergency. Built from an aramid fibre that can’t burn or melt, it’s there to protect the structural integrity of the pants in a fire. These kinds of fibres are typically built for practicality rather than comfort, but we’ve knitted them into a soft and ultra thin layer that feels more like cotton on your skin.

100 y kh t leg 3 4 front dry 1376

Fireproofing the pants makes them more breathable

While it’s completely counter intuitive, having a protective layer in the middle of the fabric makes the pants more breathable. Because it’s created from a fireproof coating rather than material, it acts like a gap or firebreak between the inner and outer layers of fabric, and it’s this invisible gap that lets air pass through the pants and makes them more breathable.

100 y kh t material detail 1376

It will take more than 100 years to break the fabric

The Martindale abrasion resistance test is the way clothing is normally tested to see how quickly it will break down. A mechanical thumb rubs the surface of the fabric repeatedly until the fibres start to break. The test goes up to 100,000 revolutions which is the equivalent of a lifetime of wear and tear. A normal polyester fabric can survive around 25,000 revolutions. These pants easily passed 100,000 cycles of wear, and even then the fabric had to be checked with a magnifying glass to see if any fibres had broken. None had.

100 y kh t stretch 1 1376

The pants stretch in every direction

Despite being insanely tough, the pants stretch in every direction and there’s no move you can pull where they’d restrict you. Apart from the reinforced ankles, the entire pants are made from the same high tech fabric with four way stretch. And every seam has been engineered to follow the way your legs move whether you’re climbing a mountain, setting up camp, or descending into a volcano for fun.

100 y kh t water detail 1376

The pants are water repellent

The surface of the 100 Year Pants is water repellent and fast drying, so a rain shower will just roll off them. If you’re out in heavy rain for a prolonged time, the three-layered construction of the fabric means that water will take much longer to get through than your average pair of pants.

100 y kh t mos flatlay 1376

How we built a pair of pants to last 100 years

Designing and building a pair of pants that can last for 100 years is an exercise in no expense spared craftsmanship. And it’s as much about what you can’t see as what you can. It starts with bespoke materials created in the most cutting-edge fabric mill in Switzerland, before being followed by hundreds of separate construction processes – from hand testing every stainless steel press stud, to stitching every critical seam twice with a heavy duty thread, to reinforcing the lining of the pockets.

100 y kh t front pocket zip detail 1376

Four giant zipped pockets to carry your gear

There are two large bellows pockets on the thighs that can open out to hold anything from your breakfast to a small machete. Each pocket has a concealed, waterproof zipper and fastens with stainless steel press studs. Above them are two large zipped side pockets. While the lining in normal pockets is made out of cotton, ours is made from a stretch fabric with reinforced seams so your hand doesn’t end up going through them like it normally does in your jeans.

100 y kh t ankle detail 1376

How the pants tighten at the ankles to fit

You’ll find a military grade belt tape on the bottom hem of both legs that attaches to four metal press studs. The belt is heavy duty, elasticated and almost impossible to snap. To tighten the pants you pull the belt out of its garage and attach it to one of the four press studs, giving you four different settings of tightness depending on what you need. On its tightest setting the belt attaches to all four press studs so it can’t come undone on the move, and there’s no spare loop to catch on anything.

100 y kh t inside leg detail 1376

You won’t kick a hole through these ankles

It’s the inside of the ankles that always takes a kicking during any adventure, so we’ve used a material even tougher than the pants themselves to stop you accidentally kicking a hole in the ankles or even putting a crampon through them. It’s made from a highly abrasion resistant rip-proof fabric with an ultra-tough polyurethane membrane. It’s attached with heavy duty bonding to give extra strength to the seams and is absurdly technical for a detail at the bottom of a pair of pants - but that’s why these are 100 Year Pants.

100 y kh t vent detail 1376

You can open up the leg vents when it’s hot

At the bottom of each leg you’ll find a heavy duty, fully bonded, waterproof zip that lets you open the pants to just below the knee. Concealed behind an extra layer of protective fabric, the zip is solid and chunky so it’s easy to operate even if you’re soaking or freezing. In the heat you can undo all the press studs at the base of the pants to open up the whole leg and roll the pants up. But if you’re just looking for extra airflow you can keep the bottom of the pants fastened and still open up the entire leg vent.

100 y kh t passport back pocket 1376

The seat of the pants is designed to last 200 years

We've reinforced the seat of the pants with two layers of material. The maths is pretty simple. If it takes at least 100 years to go through one layer, it should take 200 years of sitting to go through two. The single back pocket on the seat of the pants fastens with two stainless steel press studs and a storm flap to stop anything falling out when you sit down or run.

100 y kh t waist detail 1376

Even the waistband is custom engineered

The fly fastens with a zip, a stainless steel press stud with a rubberised cover and a second lockable press stud. The waistband has five belt loops, each with a small reinforced loop underneath for clipping on extra gear. The waistband is constructed from two layers of fabric that are bonded together for extra strength. We created tiny perforated holes in the layer of glue that bonds them together so the waistband can still stretch and air can still flow through it.

100 y kh t full front wet 1376

The watch pocket can hold 550lbs and start a fire

The 100 Year Pants come with a watch pocket just under the waistband. It’s fitted with a black nylon paracord loop that can hold 550lbs of weight without breaking – so you can clip anything you want onto it, from a flashlight to a compass. If you cut open the paracord you’ll find threads of kindling inside it, so if you’re out in nature, need to start a fire and have nothing else to hand, this will help you do it.

Inside the Schoeller factory in Switzerland

Built in the SpaceX of fabric mills

Every pair of 100 Year Pants starts its life at the same space age factory in Switzerland. Based in the mountains, Schoeller is to material technology what SpaceX is to rockets – a bunch of people and machines quietly making the future happen faster. While fire resistant clothing has historically been based on heavy, uncomfortable, chemical laden materials, Schoeller created the world’s first intelligent material that can be worn everyday then alter its behaviour in the face of fire.

Works well with