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Jeanius [Mens] Technical performance jeans

Jeanius mens performance jeans in blue denim from the front


  • Front - Jeanius mens performance jeans in blue denim from the front
  • Side - Jeanius mens performance jeans in blue denim from the side
  • Back - Jeanius mens performance jeans in blue denim from the back

Slim-fit jeans with hidden superpowers: extra-tough active-stretch denim with added moisture-wicking and temperature-regulation to hike, bike and climb in


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  • Full Description
  • Features At A Glance
  • Care & Environmental Advice
  • Size Guide
  • Customer Reviews

One pair of jeans to rule them all, one pair for cragging, 
One pair to wear for walks and a little bit of cycling. 

No need to keep Jeanius Jeans secret or safe though: they may look just like jeans and feel just like jeans, but they have hidden superpowers. 

Jeanius are a slim-fit jean tailored for activity with subtly articulated knees and a diamond-shape gusseted crotch. Their fit means you can still see your feet when climbing and won’t risk catching them in mucky bike chains, but they’ll still be smart enough to wear out for dinner later. With BCI-certified sustainable cotton and four different fabric technologies, these aren’t your average pair of jeans either... 

Our unique denim blend is designed to let your legs express themselves freely: striding determinedly up hillsides; contorting into awkward bouldering moves; performing ridiculous Monty Python walks... T400® polyester provides a superabundance of stretch and instant comfort, without sacrificing the natural denim feel. Plus it stops them losing their shape over time. 

Cordura® fibres greatly increase the durability and makes your jeans last longer. No need to worry about scuffs, scrapes and tumbles with a truly bomber fabric that’s at least 4x tougher than regular cotton denim – gritstone come at me! 

With the final two ingredients they’re comfortable in a wide range of temperatures too. Coolmax® All Season polyester wicks moisture to keep you cool and dry when you start to work up a sweat and Thermolite® hollow core fibres trap still air to keep you warm when the temperature drops. 

Jeanius Jeans: denim to properly thrash about in and withstand a life lived out in the elements. 

•Holy smokes, they're going quick!... Don't worry, more stock incoming soon.

Product Insight
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Key features
  • Cordura® denim is 4x more durable than regular cotton denim with greater abrasion and tear resistance
  • Tailored to hike, bike and climb with 4-way stretch, articulated legs and a diamond shape gusseted crotch
  • Temperature regulating combo of Coolmax® All Season and Thermolite® Core keep you comfortable year-round
  • Moisture-managing Coolmax® All Season wicks away sweat to keep you dry
  • Made from Better Cotton Initiative™ certified sustainable cotton
  • Slim fit legs allow you to see your feet better when climbing and are neater for cycling
  • Classic 5-pocket design including coin pocket and decent-sized front pockets
  • 3 Year Alpine Bond
Vital stats

Cordura Denim:
- 57% Better Cotton Initiative-certified cotton
- 12% Cordura® Nylon 6,6
- 9% Thermolite® Core polyester
- 9% Coolmax® All Season polyester
- 12% T400 Polyester
- 1% lycra

Synthetic leatherette patch on waistband


667g (Mens Medium)

Environmental Considerations

We’ve selected cotton certified by the Better Cotton Initiative, which ensures it is grown using sustainable methods.

Cordura® makes the jeans 4x more durable; longer lasting clothing is replaced less frequently and reduces our environmental impact (and saves our pennies - win win!).

Size chart Trousers Mens


Measure around your waist at the narrowest part.

S 30 76
M 32 81
L 34 86
XL 36 91.5
XXL 38 96.5

Leg Length Size

Measure from the top of your inside leg at the crotch to the floor. Where not stated size is regular.

Short 30 76
Regular 32 81
Long 34 86
What You Say: Customer Reviews and Comments

3 Reviews


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Dave R
Great Jeans so far :-)

I was so pleased when this new version of the Jeanius jeans came out,as I loved the old ones! It was just brilliant annoying old school walkers by being out on the fells in Jeans grin.The fabric technical spec looks great (though yet to be tested in anger) and sizing is actually spot on and, as a short arse, I'm very glad of the short leg length! Unfortunately, I made the mistake of erring on the larger size when they first came out, so had to wait for the second delivery to get my replacement. These fit perfectly, are very comfortable and feel like they will last. I've not noticed an issue with the belt loops, but one tiny niggle I'd change in and redesign tweak is the position of the change pocket. Every time I go to put my hand in the right pocket my fingers get caught in the change pocket! In all other jeans I've had it is slightly higher and to the left - small point, but one I know will annoy a pedant like me for some time to come! Other than that though - genius!

Stealth outdoor jeans

My two pairs of the original Jeanius jeans bit the dust quite a while ago, so great to see new ones from Alpkit. These are comfortable and have good stretch, but they just miss out on 5 star status due to the first pair of belt loops being in the wrong place (too wide) and the coin pocket location (too low).

Jeanius so far!

Just got a pair of these and are super comfy for cycle commute/office/general bodding duties. Generous sizing and loads of stretch mean they are as comfy as trackies.
Can't say how resilient they are to the saddle wear that destroys all my other trousers but here's hoping they are better!
Only slight negative would be the belt loops on the front are too far apart, so there is a tendency for the front fastening to drop below the belt. Minor probs.

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