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Thermal Zephyr Runner Jacket

Thermal Zephyr Runner Jacket

M's Thermal Zephyr Runner Jacket

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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

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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.


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Customer Reviews

Based on 3 reviews
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.

Erik J.
Wear it for: Running, Hiking, Camping
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M

I've been waiting for years for Janji to release a brightly colored insulated jacket, and it's finally here! Haven't had a chance to really test it too much yet, but first impressions are it's super lightweight and comfortable. I live up in Maine, so I'll be putting that 15-45°F temp rating to the test. Nicely done, Janji!

Seth P
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
Really Great Lightweight Jacket!

This Jacket is worth every penny. It's lightweight and breathable, but also has enough warmth to keep you going on a run in the wind, rain, and any other elements that mother nature might throw your way. It's got a pocket on the inside to keep your belongings, true to size (I bought a medium and am 5'10 and 183), and very comfortable to wear. While I might not necessarily wear this in the cold winter months without some base layers underneath, this coat has fast become my go-to choice for a breezy/chilly day. HIGHLY recommend!