New Arrivals

Shop Now

Free shipping on orders $75+

Save 15% more

Janji Collective
3 pockets
run everywhere
free shipping on
orders over $75
free 60 day exchanges
+ no-fuss returns

Thermalrunner Reversible Vest

Thermalrunner Reversible Vest

Vaporlight insulation, packable design + reversible versatility

COLOR >>  
W's Thermalrunner Reversible Vest
size >>

Hurry, only a few left in stock!


Join now to unlock access



Join now to unlock access

run everywhere guarantee
free shipping over $75
free 60 day exchanges
Shea is 5'1" // she wears size XS
Marissa is 5'9" // she wears size S
Regular fit, Size Chart

Winter warmth meets versatile styling – Janji's Thermalrunner Reversible Vest features vaporlight insulation for warmth where you need it, plus dual colors for mixing + matching. Read more

Explore more


Strategic warmth
40g PrimaLoft® Gold Active Insulation provides core warmth

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 allows 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

Comfortable coverage
Zipper garage protects chin and neck

Signature reflective logos for improved visibility in low light

materials + specs

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

PrimaLoft Gold Insulation Active
100% nylon (45% recycled)

136g / 4.4oz (M’s Medium)

Garment made in Vietnam

CFM is the rating that measures how windproof a fabric is - 0 is totally windproof. With a CFM of 16, our Zephyr fabric cuts most wind while staying highly breathable - ideal for running performance.


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

Customer Reviews

Based on 2 reviews
Rachel D.
Wear it for: Running
Product Fit: Runs large
Height: 5'1" to 5'3"
Usual Size: XS
Size Purchased: XS
a decent first iteration

AFAIK this is the first iteration of a vest from janji and it’s /fine/. i’m sure next year’s version will be better, and boy is there room for improvement. for starters, the sizing is wildly off. it’s incredibly roomy in the body, especially at the bottom where it seems to flare outward, whereas the shoulders are constricted. there’s elastic on the armhole seams (my best guess is to fit snugly against whatever layer you have underneath and prevent lots of air from coming in). however, it causes the vest to feel tight (and again, the vest is way too big for me everywhere else). there are three pockets but they’re not all functional at once; the print side only has a top chest pocket while the side pockets are only accessible on the solid side of the vest. most shoppers are drawn to one side of the vest over the other (in my case, the print, which is so so good). it seems insane to force the consumer to choose between form OR function. the vest keeps me warm and i love the print so i’ll probably keep it, but i really hope the next versions of this vest are a marked improvement.

Hi Rachel - thanks so much for taking the time to share your feedback. As you noted, this is our first iteration of the Thermalrunner Vest, and we will share your suggestions with our design team to help improve future versions.

Jess C.
Wear it for: Running
Product Fit: Runs small
Height: 5'4" to 5'6"
Usual Size: XS
Size Purchased: XS
Odd fit for XS. Negligible variation in insulation pattern.

Firstly, I am a huge Janji fan and have turned many onto the brand. I have the Rainrunner Pack Jacket and Thermal Zephyr Runner Jacket, both in XS. Love both. This one missed the mark for me.

I was hoping the fit of this vest would be similar to the other jackets, but the shoulders are cut a little narrower. I'm not broad-shouldered, by any means, but the top seam doesn't cover most of the shoulder as pictured on the product page. It stops at the pointiest part of my shoulder and the downward cut + elastic cinching creates puffiness at my traps. The body of the vest is already quite roomy, so going up in size isn't an option. Laid flat, it's an inch wider than the Thermal Zephyr Runner.

I had also hoped the insulation pattern would be more similar to the Thermal Zephyr Runner - gloriously breathable under the arms and middle back - but the difference in thickness across the various panels of this vest feels negligible. If cozy is what you're looking for, this might fit the bill, but I'd expect to pay less for a vest with this level of tech.

One last note for the suggestion box: the chest snap should be standard on all Janji outerwear!

Hi Jess - thank you for your detailed feedback, it's extremely helpful for our design team as we work to continuously improve our product fit and features.