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Kepler Long John [Mens] merino base layer leggings

A man wearing a pair of mens merino long johns in black


  • - A man wearing a pair of mens merino long johns in black
  • Black - Mens merino long johns in black

Merino leggings for cold weather layering: moisture-managing, temperature-regulating and odour-resistant, Core Spun with nylon for durability


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

Winter walking epics, hunkering down on hoarfrost-ed chairlifts or staving off sleeping bag shivers: an extra layer of woolly warmth is the best defence for when the mercury plummets and the bitter wind bites.

The Kepler Long Johns are the ideal addition to your cold weather layering system. The superfine (17.5 micron) merino we use has an excellent warmth to weight ratio and, as an ‘active fibre’, responds to temperature changes to keep you warm in the cold and cool when you’re working hard.

Merino is also highly breathable, transporting your body’s moisture vapour outside without feeling wet to the touch. Whether you’re slogging up a Munro in knee-deep snow or standing around on the summit waiting for your pals, you’ll stay warm and dry. 

We’ve used Core Spun merino for underwear, a technology with all the benefits of merino but with added durability. It’s still merino on the outside but a nylon and spandex core produces a yarn that’s harder wearing and rebounds back into shape better than 100% merino. 

Wool is a naturally odour-resistant material, meaning you can go longer between wash cycles on multi-day trips – kinder on the planet and anyone you’re sharing a bothy with!

Flat-lock seams, a low-profile waistband and next-to-skin cut ensure the Long Johns layer neatly under your outer trousers and the superfine merino is soft against the skin. We also only use merino from Australian non-mulesing farms for happy legs and happy sheep. 

Product Insight
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Key features
  • High warmth to weight ratio of superfine merino and natural temperature regulation properties keep you warm in cold weather and cool when you heat up
  • Merino Core Spun with nylon and spandex improves fabric durability, recovery and stretch whilst retaining all the benefits of merino wool
  • Wool is naturally highly breathable, absorbing water vapour into the internal structure of the fibres before evaporating it, wicking away liquid sweat when necessary
  • Merino is naturally odour resistant allowing you to wash it less frequently
  • Next-to-skin cut and low-profile flat-lock seams enable easy layering
  • 3 Year Alpine Bond
Vital stats

86% Merino / 12% Nylon / 2% Spandex (200 gsm)

Australian non-mulesing superfine 17.5 micron merino

Environmental Considerations

We use 100% natural Australian merino from non-mulesing farms. What is mulesing-free merino?

Product Care Information

The better you look after this merino garment, the better it will look after you. Give your Kepler a long, happy life with these tips:

Hand wash your merino in lukewarm water, or gentle machine wash at 30°C.

Darn any holes as soon as possible so they don’t grow.

Avoid snagging, vigorous machine washing, putting your finger through the fabric, and hungry moths.

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

2 Reviews


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Ross Philpot
Great bit of kit

Had these for a few weeks now, have worn them numerous times when out cycling and they're superb. Really good quality, super soft and they keep you really warm. Great job Alpkit.

Fantastic quality and great service!

Ordered these as a gift - they arrived extremely quickly (despite all the christmas post) with a lovely handwritten note to say thanks! The quality of the material is absolutely fantastic - softest merino I've felt by a long way compared to Icebreaker, Crane etc. smile Definitely recommend!

What They Say: Kudos - Product Reviews from independent magazines and websites

Kepler Merino Review in Velome

Mountain biker Jessica Strange puts our Kepler Merino top to the test in South Wales

The top is really lightweight, soft and totally breathable which is ideal for a day's riding as I felt both warm and "airy"


my Alpkit Merino wool layer whist riding was really comfortable


Great quality, fit and features


Velome September 2015 - Jessica Strange

Women Climb Kepler Merino Top Review

I love the design of this women specific base layer top. It looks as good on its own after a hard day of climbing as it does at the crag under all your layers. The people at Alpkit have clearly thought about every aspect of this garment and tested it out to create a beautifully designed and functional garment that is perfectly fit for purpose

Emily Pitts

WomenClimb October 2015 - Emily Pitts

Wild Running Top Mens Winter Running Gear

Sim Bensons ideal winter running gear

Merino wool base layers are normally the warmest, and as long as they are ethically produced you can feel happy wearing a natural fibre. I wear either my Alpkit Kepler (RRP £29) or my Howies short-sleeve base layer (RRP £45) pretty much all the time. They look great as well as performing brilliantly in all but the warmest weather. Synthetic base layers dry faster than Merino, but Merino retains its warmth even when wet

Sim Benson

Wild Running October 2015 - Sim Benson

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