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Kepler Boxers [Mens] pure merino boxer short

Super comfortable, natural fibre technical merino boxer shorts

Kepler merino wool thermal boxers in blue
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  • Nemo - Kepler merino wool thermal boxers in blue
  • Tarmac - Kepler merino wool thermal boxers in grey
1. Colour / Size
Fitting guide

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Whether you’re skiing Glen Coe or going for an ascent of Pitz Badile, you need to get your layering system perfect from bottom to top. Your whole layering system.

There’s no point in donning all your high-tech clothing if you’re wearing a pair of cotton undies underneath it all.

Kepler boxer shorts let you start your layering system the right way.

Cut for comfort, the high waistline stays away from where your other garments may sit in your layering system, a wide waistband prevents rubbing and keep the briefs from riding down.

The low-profile, slim-fit cut and exquisitely soft ultrafine merino fabric will make these suitable for active use. 


The Kepler range uses beautiful, ultrafine merino for a luxuriously comfortable next-to-skin feel.

With thermoregulatory and anti-microbial properties, merino wool is more than a match for day-in, day-out use across the temperatures in changeable mountain conditions, help you to stay fresh, comfortable, and protected no matter what the weather decides.

We use 100% natural New Zealand merino from non-mulesing farms.

Key features
  • 3 Year Alpine Bond
  • Pure merino briefs for active use
  • Low profile fit for easy layering
  • High, wide waistband and gusseted crotch for comfort
  • Flatlock stitching for next-to-skin comfort
  • Merino wool minimises odours
  • High warmth-to-weight ratio
  • Ultrafine merino for softness and comfort
  • New Zealand merino from 100% non-museling farms
More images
  • Mens boxers blue back-2 - Nemo
  • Mens boxers blue front - Nemo
  • Mens boxers blue side - Nemo
  • Mens boxers grey front - Tarmac
  • Mens boxers grey back - Tarmac
  • Mens boxers grey side - Tarmac
  • Mens boxers blue detail 02 - Nemo
  • Mens boxers blue detail 01 - Nemo
  • Mens boxers grey detail 01 - Tarmac
  • Mens boxers grey detail 02 - Tarmac
Vital stats

Fabric: 100% New Zealand merino, 200 gsm, 17.2 microns
Seams: Flatlock stitching

Origin: China

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.

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
Men's sizing
Chest (inches) 37" 40" 43" 46" 49"
Waist (inches) 30" 32" 34" 36" 38"
This size chart indicates the body measurements our garments are designed to fit. Measure yourself as described below, and use the size chart to find your size.
Chest: measure around your chest at the widest part. The tape measure should pass under your arms, and be level from front to back.
Waist: measure around your waist at the narrowest part.
Hips: standing with your feet together, measure around your hips at the widest part.
Related products

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pure merino wool ¼ zip base layer top with long sleeves


Kepler Briefs [Mens]

merino underwear


Kepler Boxers [Womens]

pure ultrafine merino wool boxers


Kepler Briefs [Womens]

pure merino wool underwear for active use


Kepler Long John [Mens]

Pure ultrafine merino base layer leggings


Kepler Padded Boxer [Mens]

pure ultrafine merino padded cycling boxers

What You Say: Customer Reviews and Comments

7 Reviews


Used this product?

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Kepler Merino Boxer

Having read one or two mixed reviews about these boxers I was a little apprehensive about replacing a worn out pair of Howies with these. However, as with anything else I've bought from Alpkit, you get great value and quality with a very comfortable fit. I ran 13 miles off road in these straight out of the packet, and as with decent underwear, I didn't even think about them. They dried very quickly and even with my stinky sweat didn't smell an hour after finishing running. I would certainly recommend.

Good boxers for travellers

I needed merino underwear for bikepacking bicycle travels, something comfortable and suited for multi-day use in camping situations. They check both requirements. Light, comfy and well crafted. Reccommended.

Great piece of kit

Have now had these for six months and think they are a great piece of kit. Used during a 8 day hike of the tour the Mont Blanc in pretty cold conditions and a 3 day hike in Canyon Cola in Peru in very hot weather. Never had any issues with fit - always feel comfortable. And never had issues with washing them - although I always hand wash. However, they definitely develop a smell after a few days use but nothing I don't consider normal under the circumstances in which I've used them!

Stu Farrell
Mens Kelper Boxer Shorts

Just completed the Trailwalker 2016 event in these, so I walked for 100km in just under 24hours wearing the Kepler shorts. I have to admit they were a panic purchase and a bit of a luxury at the price with the worry of being uncomfortable for that amount of time.
I found the material and the fit absolutely spot on. The problem I had with them though was the seam going between my buttocks. Unfortunately the seam didn't go nice places or do nice things with it constantly riding up in between. It wasn't a massive hinderance but more of a constant niggle I was always aware of.
I also forgot to pack any fresh underwear for the following day so was stuck in the Keplers for over 48 hours and no unpleasant scent.
On the whole a good product with a strange seam placement but knowing Alpkit they had a good reason.

Charles B

Decent enough and do what they say but they fit more like hipster undies, which makes them feel too short at the waist. If they came up a bit more they would be spot on.

John O
Short in the leg

The first pair that I bought were great, quite long in the leg so no issues with riding up while walking/climbing. Liked them enough to buy another pair. However the second pair fits completely differently, much shorter in the leg, and more prone to riding up uncomfortably.
If second pair were like the first then I would be very happy with them.

Chris R
Comfy and warm and they don't smell, but...

I'm on my second pair. These are lovely and warm and don't smell, even after wearing them for days in the wilderness. The first pair sadly developed holes after wearing them twice. I asked Alpkit for their advice, they were very helpful and said washing at 40 degrees was causing the problems. They were nice enough to send me another pair. Since then I have washed my new pair on a 30 degree delicates cycle but sadly this pair have quickly developed a hole too.
Great boxers but not robust enough.

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


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


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