New Arrivals

Shop Now

Free exchanges + no-fuss returns

Are you a Janji Collective member?

Join + Save

Free shipping on all orders $50+

recycled materials
run everywhere
guarantee
free shipping on
orders over $50
free 60 day exchanges
+ no-fuss returns

Thermal Zephyr Runner Jacket

Thermal Zephyr Runner Jacket

Lightweight insulated warmth + weather protection in an ultra-packable jacket

COLOR >>  
M's Thermal Zephyr Runner Jacket
size >>

 

THIS PRODUCT IS ONLY AVAILABLE TO JANJI COLLECTIVE MEMBERS

Join now to unlock access

JOIN JANJI COLLECTIVE
run everywhere guarantee
free shipping over $50
free 60 day exchanges
Regular fit, Size Chart William is 6'1" and wears size M

With nylon ripstop and a water repellent finish, the Janji Thermal Zephyr Runner Jacket provides nearly weightless warmth in a small, easily stowable package for chilly trail adventures.Read more

Explore more

features

Weightless feel
Ultra-light ripstop shell sheds light rain and snow with a PFC-free DWR finish for more eco-friendly weather protection

Targeted insulation
The Thermal Zephyr uses the lightest active insulation that exists to cover the areas where you need the most warmth while allowing for greater breathability + heat release where you don’t

Hold it down
Chest snap under zipper allows for adaptable venting

Better warmth
PrimaLoft® Gold Active Insulation with 45% recycled content provides more sustainable warmth on colder days

Lock it down
Minimal semi-elastic cuffs protect against the weather while allowing room for gloves or mittens

Designed for the trail
Dropped back hemline acts as a splatter guard to keep you warm and dry on messy trail adventures and bungee toggles at the hem cinch the jacket down for extra wind protection

Stay seen
Signature reflective logo on front and “watermark” reflectivity on back increases visibility in low light

materials + specs

Zephyr Runner
100% nylon ripstop (38gsm) w/ PFC-free DWR

Targeted insulation
PrimaLoft® Gold Active Insulation — 45% PCR (post consumer recycled) content, 55% polyester fill

Weight
169g / 5.9oz (M’s Medium)

Garment made in Vietnam

sustainability

The Thermal Zephyr Runner uses PrimaLoft® Gold Active Insulation with 45% recycled content for more sustainable warmth on colder days. The shell features PFC-free DWR finish for more eco-friendly weather protection.

Our Zephyr Runner fabric is also 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.

JOIN THE COLLECTIVE

Already a Janji Collective member? Log in to unlock access now.

Customer Reviews

Based on 13 reviews
92%
(12)
0%
(0)
8%
(1)
0%
(0)
0%
(0)
A
A.F.
Wear it for: Running, Hiking, Cycling, Mountain Biking
Product Fit: Runs small
Height: 6'0" to 6'2"
Usual Size: XL
Size Purchased: XL
don´t go out without the jacket,

incredible jacket, one would think that it is very light to keep warm, but it is perfect, it became the jacket that I wear everywhere. in all situations, even on the bike in semi-cold situations.

plus: it is so small that it is impossible to go out without it.

I would love a version with a hat, for those even colder and windier situations.

C
Clement H.
Wear it for: Running
Product Fit: Runs small
Height: 5'4" to 5'6"
Usual Size: M
Size Purchased: M

M's Thermal Zephyr Runner Jacket

A
Aaron S.
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
Versatile, lightweight, perfect

Title says it. I wear this anywhere from 50 F down to 10F, haven’t tested lower. Difference is a merino long sleeve baselayer for cold weather or t shirt for warm.

It’s super lightweight and packable, perfect for my long runs in the mountains with a cold start (20F average winter start).

Dries fast, has a nifty chest button for venting when I get warm, too.

Love it all around ! 150 lbs, 5’10”, size medium is perfect

A
Alexis B.
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: L
Size Purchased: XL
Game changer!

I get hot real quick in like 5 min and this jacket will definitely keep you warm during those frigid temperatures. I've ran in it with temperatures hovering around 7°. I'm so glad I made this purchase!

K
K
Wear it for: Running
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
It’s light, thin, and warm?!

It’s a pretty phenomenal jacket so far! I’ve found that other reviewers comments that t-shirt underneath is all you need for most runs until you get down to below freezing.

R
Richard A.
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: XL
Size Purchased: XL
Great breathable winter jacket

I’ve tested this jacket from 25-40 degrees. It is warm but breathes well. If colder a thicker base layer would help compensate. One large inside pocket big enough for a phone but I wish it had more stash pockets.

R
Rusty M.
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: L
Very Functional

I was only somewhat doubtful to the functionality of the Thermal Zephyr Runner jacket, but as my cool and sometimes cold weather runs progressed, this jacket was quite a pleasant surprise. The texture & construction of the jacket does indeed act as an insulating garment the it could be too easy to overdress for a cold run. I live in the Midwest, so our winters can be cold and very windy, as well.I’m glad I bought large so layering wasn’t an issue.

D
Dana K.
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
Lightweight warmth

I got this jacket for my dad for Christmas. He gets cold easily and he plans to use it for his morning walks or early morning tee times. He loves it. It's super lightweight but has surprising warmth. The pockets are nice and he appreciates the elastic band at the wrists to keep the cold out. Thank you, Janji!

J
Jez G.
Wear it for: Running
Product Fit: Spot-on
Height: 6'0" to 6'2"
Usual Size: L
Size Purchased: L
Witchcraft!

What kind of dark magic witchcraft was used to create this jacket!? Don't let the super lightweight and thin material fool you - this is a seriously warm jacket. Putting it on the first time I instantly felt the heat radiating back to my body.

Which means you seriously have to think about what you wear on your run. Anything in the 40's and I am too hot with anything else other than a tshirt under it. In fact I have stopped running in it in any weather above 40f. Today's run in 28f weather saw me in my AFO shorts (yeah, I wear those ALL year!!), the new merino long sleeve top and this jacket, and by mile 5 I was over heating!

If you run in cold weather this is definitely a must have for your cold weather gear!

UPDATE - I feel the need to add to this post... this mornings run was done in 15f/-9c weather, wearing my AFO shorts (yep, I truly do wear those ALL year round), an ioMerino base layer (for me they are the best merino products out there bar none - sorry Janji!), a Repeat Merino Tech long sleeve (but I didn't say your merino products weren't any good!) and the Zephyr thermal jacket. By mile 2 I was too hot and had to do the rest of the 5 miles with the jacket zipped open! Seriously the best winter running jacket ever.

J
Jordan J.
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: S
Size Purchased: S
go run jacket

easily my go run jacket now (and am literally just wearing this casually). packs down super light and never makes you feel too cold or too hot. 10 out of 10.