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M's Mercury Qtr-Zip in Plateau

Regular price $94 Sale price $71
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Sustainable materials, responsibly made.

This new fabric is pretty life changing
I have a few long sleeves from Janji, and this is by far the most comfortable fabric. It’s soft yet breathable. 

— Seth, Janji Wear Tester
  • Color Plateau

    Color Plateau

    Color Plateau

    Color Plateau

  • Nightshadow

M's Mercury Qtr-Zip in Plateau

Aron wears size M and is 5'11" Slim fit, Size Chart

Don’t let the coziness of this quarter-zip fool you. Made of our 4-way stretch Mercury Knit fabric, this streamlined mid-layer offers lightly peached warmth, moisture-wicking management and dependable protection for cold weather running comfort. Read more

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behind the design

behind the design


Cozy warmth


Peached softness


Cold weather running comfort. The design of our streamlined Mercury Qtr-Zip is based on those four words. A refined raglan sleeve allows for total freedom of movement while integrated thumb slits and a cadet collar add extra protection. A single zip chest pocket keeps storage simple. The true stand-out feature of this modern update on the classic mid-layer is the fabric, which is both high-performing and exceptionally soft and cozy — thanks to light peaching on both sides that provides warmth without added weight. This is the new go-to when the mercury drops.



Cold weather running comfort
Breathable, moisture-wicking Mercury Knit excels at transferring sweat + heat away from the body for comfort during prolonged efforts

For when the mercury drops
Lightly peached on both sides, Mercury Knit provides cozy warmth + thermoregulation without added weight

Freedom of movement
A refined raglan sleeve design, underarm gusset + 4 way-stretch fabric ensure a streamlined fit with full range of motion

Secure chest pocket
A single chest zip pocket can secure a phone

Better thumb slits
Integrated thumb slits built into the cuffs essentially disappear when not in use

Hang it up
An elastic locker loop is integrated into the back collar

Janji signature blue reflective logo on front + “watermark” on back ankle increases visibility in low light

materials + specs

materials + specs

Mercury Knit
78% nylon, 22% spandex

273g / 9.6oz (M's Medium)

Garment made in Vietnam

Fabric Callout

Fabric Callout

Mercury Knit

A 4-way stretch fabric with light peaching on both sides for breathable warmth without added weight, Mercury Knit reinvents how cold weather performance gear should feel — it’s a new level of winter running comfort.

Shop All mercury knit



Mercury Knit is made of premium, durable nylon and is bluesign® certified meaning it is free from harmful chemicals and is fabricated in a way that meets a high environmental standard.

Learn more about our sustainable initiatives here.

Customer Reviews

Based on 6 reviews
Can I go out in it again, please🙏

It’s a bit awkward when an article of clothing shoves all its counterparts to the back of the closet. The Mercury quarter zip and I have been inseparable since it’s arrival. It’s smooth sleek surface has a great touch. I’ve found it a perfect top layer here in the Pacific Nortwest as it adds warmth and windbreaking ability. There are many shades of green out there and this is a favorite - in many ways. Thank you Janji.

Love it!

So nice! I’ve been looking for great winter running tops for our Minnesota winters and these so the job. The fabric is very soft and feels like it takes the bite out of the wind while also wicking sweat so I don’t get too cold or hot. Just right!

Everything I wanted

This Mercury material really is superb. I wore it on a recent run that started cold and it kept me cozy. Then the temperature quickly rose to a degree where I thought this top would get too warm. But it stayed breathable the whole time and I never felt overheated. Fit is also superb!

Excellent - happy I bought this!

This is an excellent mid-weight 1/4 zip.
I have many different brands and kinds of tops like this but this one is going straight into the main rotation. Very comfortable and has the perfect amount of stretch. Love the colour.
Highly recommended!

Soft and works well for warmth

This Mercury Qtr-Zip top is nice and soft and I appreciate the thumb loops on the sleeves. It keeps me nicely warm on jogs down to the low 40s degF so far. Below that I need to start layering.