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W's Zephyrunner Wind Shell

incredibly versatile, hyperlight protection, ultra packable
Color Midnight
Select your size
Regular fit: Athletic fit that provides enough room for range of motion and air circulation – just right for comfortable movement
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The ultra-packable Zephyrunner is designed to provide indispensable protection for moving quickly across varying and fast-changing conditions. This lightweight, water-repellent jacket balances protection, breathability, and versatility in a nearly weightless layer that stops wind without preventing heat release during high-output efforts.

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Features

Strategic breathability
Back panel venting keeps you comfortable while maintaining wind protection

Better than zero
The Zephyrunner strikes a perfect balance of wind-breaking breathability with a CFM rating of 16 engineered specifically for running + high-activity output activity

Multi-condition preparedness
Hyperlight, durable nylon shell is water-resistant and wind-blocking for whatever the trail may bring

Ready for anything
Stows into chest pocket for easy packability

Secure fit
Bungee hem and hood toggle allow for an adjustable fit on the fly, reducing exposure in windy conditions

Keep it separated
2 zip hand pockets and a zip chest pocket stash small essentials close at hand

Visibility
Signature reflective logos for improved visibility in low light
Materials + Specs

Zephyr
100% nylon with PFC-free C0-DWR (durable water repellency)

Weight
123g / 4.3oz (W’s Small)

Garment made in Vietnam

CFM is the rating that measures how windproof a fabric is - 0 is totally windproof. With a CFM of 16, the Zephyrunner cuts most wind while staying highly breathable - ideal for running performance.
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W's Zephyrunner Wind Shell
W's Zephyrunner Wind Shell
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$138
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Customer Reviews

Based on 31 reviews
87%
(27)
6%
(2)
0%
(0)
3%
(1)
3%
(1)
E
Estela G.
Wear it for: Everyday wear
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: XS
Size Purchased: XS
So light

AMAZING

G
Gina W.
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: M
So light and attractive

Love this wind shell. It is deceptively light and attractive, but does its job! I am a “smedium” in tops 5’4” and 125 lbs with broad shoulders and the medium fits well.

M
Meg E.
Wear it for: Running
Product Fit: Runs large
Height: 5'7" to 5'9"
Usual Size: S
Size Purchased: S
So light

This jacket is incredible in wind but also surprisingly light and comfortable. No odd fabric rubbing sounds. Fits great.

M
Michelle
Wear it for: Running
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: S
Perfect lightweight jacket

Loved this jacket so much that I bought a second one. Super lightweight and easy layer to take off. Lots of pockets and the bungee around the hood lets you to keep it secured on your head. Great staple piece!

L
Lindsey
Wear it for: Running
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: S
Size Purchased: S
Perfect running outer layer

I live and run in southeastern Tennessee where it can get a bit cold (20s at times) and windy in the winter months. This layers perfectly over a long sleeve so I don’t get too hot. I hate wearing insulating layers because I overheat with them. This jacket helps keep me just the right temp. My Patagonia Houdini feels hotter than this. The fit is relaxed enough that I could wear a vest under it, and I like the hem length. I bought the red for visibility and it’s perfect. I also appreciate the reflective detail and the drawstring/cinch on the hood. I wore it over my Janji merino blend longsleeve in 30 degree temps with10mph winds (and 25mph wind gusts) this morning and was pumped at how perfect my layering felt.

V
Victoria B.
Wear it for: Running
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: S
The perfect windbreaker!

Bought this for a 100M fall mountain ultra and it did not disappoint! I'm petite and the small fit perfectly with just enough space in the arms for mid-layers. It's not too bulky or hot and packs down very compactly in my race vest. This is definitely a gear staple and the color is beautiful!

M
Megan S.
Wear it for: Running, Hiking, Camping, Cycling, Everyday wear
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: S
Fantastic

I love this jacket! I wear it everywhere and for everything. Very comfortable and fits very well.

A
Amy L.

W's Zephyrunner Wind Shell

K
Kelsey C.

W's Zephyrunner Wind Shell

L
Lori N.
Wear it for: Hiking, Everyday wear
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: XXL
Size Purchased: XXL
Perfect lightweight jacket

I love this jacket so much. This was my first Janji purchase. I love the fit, bright color scheme, the performance in cool weather. I am not a runner, but it works for walks and hikes in mild SF Bay Area weather. I am 5’3.5” and weigh 200 lbs, 38J and apple shape, and the XXL is a perfect fit. I hope this review is useful for the larger sizes shopping this brand as most of the reviews so far are for smaller sizes. I appreciate the range of sizes available.

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