Free UK Shipping Over £50

Are you a collective member yet?

Join & Save
run everywhere
free shipping on
orders over $50
free 60 day exchanges
+ no-fuss returns

Thermal Zephyr Runner Jacket

Regular price £135 Sale price £90
Unit price  per 

Thermal Zephyr Runner Jacket

W's Thermal Zephyr Runner Jacket

Hurry, only 1 left in stock!

Heads up, this gear will ship in 6-10 weeks. Learn more about pre-orders.


Join now to unlock access

run everywhere guarantee
free shipping over £50
free 60 day exchanges
Regular fit, Size Chart Gabby is 5'8" and wears size S

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

Nearly weightless warmth

Super compressible PrimaLoft® Gold Active insulation packs a ton of breathable warmth — ideal for high-output movement — in an ultra-packable design

Bungee toggles

Bungee toggles allow the hemline to be cinched down in extra cold or windy conditions

Ergonomic sleeves

Streamlined sleeves with semi-elastic cuffs stay in place in motion



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

169g / 5.9oz (M’s Medium)

Garment made in Vietnam


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.

Customer Reviews

Based on 16 reviews
Mindy Statter

Would like an outside pocket (s)

kristi caggiano

The best lightweight, warmth outer layer. Fit is great (xs 5' 4", 110lbs) cardinal color is eye-catching but no obnoxious. Zips easy and is comfortable.

Amy Wong
Great lightweight winter outer layer

Snagged the obsidian on sale and had to come back for this gorgeous color. It's very lightweight and has an inner zip pocket perfect to store your keys and a mask - just wish it had outer zip pockets as well. It's extremely warm for how lightweight it is and has held up really well except for sub zero real-feel temps in Boston. Definitely not cheap, but I'm glad I saved up for these and don't regret getting a second color. Expecting these to hold up very well for years to come.

Obsessed in Arizona!

I bought this jacket after loving the original Zephyr Runner jacket for rainy days. I wasn’t sure if I’d get a ton of use out of it as I run in the Sonoran desert of Arizona, but I’ve worn it so much this winter on chilly morning runs when the temps are upper 30s to low 50s. Most days I can wear it with just a sports bra underneath and it keeps me plenty warm, but I can throw on a long sleeve base if needed. It’s great at shielding me from the wind and I love how packable it is, plus the cardinal color is gorgeous. Only wish it came in more colors!

The best running jacket

I live in the Midwest, so running throughout the year can require a few different layers. When I first bought this jacket, I was a little skeptical since it was so light and thin, but it really solves every problem I've had with running in the winter. Paired with a thermal shirt underneath, I can wear it in sub-zero temps without getting too cold. It's also not too warm on a 30 or 40 degree day. It does a great job keeping the wind off my chest when its zipped all the way up.


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

Learn more here