Guaranteed Delivery by 12/24

Free shipping on all orders $50+

Free Exchanges + No-fuss Returns

Explore our Staff Picks

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

Groundwork Flyby Tight

Groundwork Flyby Tight

M's Groundwork Flyby Tight in Midnight
size

Heads up, this gear will ship in 3-5 weeks. Learn more about pre-orders.

THIS PRODUCT IS ONLY AVAILABLE TO JANJI COLLECTIVE MEMBERS

Join now to unlock access

JOIN JANJI COLLECTIVE

Hurry, only a few left in stock!

run everywhere guarantee
free shipping over $50
free 60 day exchanges
Aron wears size M and is 5'11" Formfitting, 28.5" inseam, 
Size Chart

Durable stretch nylon, a double-lined front panel — for extra protection and modesty — and four pockets make the Flyby Tight the go-to for any distance in colder conditions. Read more

Explore more

features

All about the Groundwork
Breathable, moisture-wicking fabric provides light compression with an unnoticeable feel in stride

Won't sag out
Durable nylon stretches with you and retains its shape while resisting odors

Secure, unfussy fit
A minimal waistband with internal drawcord stays snug + comfortable

Extra support
Double-lined fabric in the front panel (from hip through thigh) for added protection + warmth

Pocket it
Two deep side pockets can easily accommodate the largest phone sizes plus case and minimize any movement or bounce

Keep it separated
An internal waistband pocket can stash card/cash or key

Versatile storage
Back dual-sided-entry stretch pocket can store nutrition + dual as a pass-through for a shirt

Zipperless ankle design
Articulated ankle shaping and a laser cut hem allow easy on/off + adaptable wearability to roll up the tight when warm

Stay seen
Integrated hi-vis reflective tape along the side seams along with Janji signature blue reflective logo and “watermark” on back increases visibility in low light

materials + specs

Groundwork Knit
68% nylon, 32% spandex

Weight
243g / 8.6oz (M’s Medium)

Garment made in Vietnam

Fabric Callout

Groundwork

High-performance, moisture-wicking stretch nylon with durable support. Explore more behind our tights and sports bra fabric.

SHOP ALL GROUNDWORK

sustainability

Groundwork Knit is made using a premium grade nylon that has a significantly tighter woven filament than standard synthetics. Tighter filaments mean less microfiber shedding in the wash-cycle, plus greater durability of the garment (longer lifespan, more wearing).

Groundwork Knit 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 71 reviews
68%
(48)
18%
(13)
8%
(6)
4%
(3)
1%
(1)
M
Mark Brewer
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: L
Size Purchased: L
Love these.

Love all the pockets. I’m now abandoning all tights without serious pockets. These are not compression tights like some. Good fit however. Appreciate some color options instead of all black at most places. Recommended.

J
Jon Beyer
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
Best winter running tights

These tights fit great with the right amount of compression, storage, and provide the right amount of warmth. I have run in them in temps from 28-40 degrees and they are perfect. No need for additional layers. Good to have color options other than black for men’s running tights. One small complaint is that the drawstring is a bit short.

W
Walter Gies
Wear it for: Running, Climbing
Product Fit: Spot-on
Height: 6'0" to 6'2"
Usual Size: S
Size Purchased: S
Great tights

I’ve had other Janji tights that didn’t fit right but I gave the company another shot after these tights rolled out, and I’m so glad I did. These fit great, stay in place on long runs, are warm, great color, and quite affordable. After I ran in my first pair I immediately bought more as they will probably sell out. I like them better than my tights form lululemon that are in the 140 range.

A
Aaron Garcia
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: S
Size Purchased: S
R2R2R tights

These tights were a last minute purchase for my [****] run/hike I was about to go on. I needed something that would keep me warm in the morning and evening but wouldn't overheat me in the afternoon and these were perfect for just that. They took a beating but did a great job throughout the entire day. I also loved all the variations of pockets available. This is a great piece of gear if you need storage for a long run with or without an additional pack.

W
Wyn Parksook
Wear it for: Running
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
Great fall/winter tights

The fabric is very comfortable and the fit is great. One minor problem is that the waist can be pulled down after some time (probably when I put my phone in the pocket). Other than that this is a great pair of tights.

J
Jacob Neumann
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
an absolute workhorse.

These are my new go-to tights...
At first I was concerned about the lack of zipper at the bottom but its turned out to be an incredible benefit to not having it there. The opening stays fit flush to the leg and easily fits over socks. There is no weird bunching or rubbing from a zipper. The pockets on this are FOR REAL. They hold everything from phones to nutrition, but what I've been using them for (and successfully might I add) is to hold a soft flask of water. These are a versatile workhorse that have function and utility for days. The sustainability and humanitarian efforts that Janji focus on paired with the quality of these tights make this purchase a no brainer... and one im going to make again in the near future.

G
Gray A.
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
Will I ever wear another pair of tights again? Probably not.

These are seriously the most comfortable running tights I have ever had. The fabric is soft, is just the right thickness for chilly days, and has the perfect amount of stretch without being too stretchy. And as someone who does a majority of my running in the dark I am grateful for the reflective details. The best part though, hands down, are all the pockets! Six pockets! Since they arrived, I haven’t reached for any other tights.

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

Among the several running tights I’ve purchased from Janji the past couple years, this current model seems to be the best fitting; not too small, not too big. Pocket storage is amazing and looks like they will accommodate many items. I tend to carry a minimal amount of items but usually chapstick, a bit of nutrition, and key fobs during running races. Btw, the ‘Mountain’ color is a fun color, a definite departure from the usual blacks & grays.

J
Joshua Ray
Love these

Love the look of these and the fit. The only downside is the drawstring cord is super stretchy and a bit hard to get tightened and tied.

J
Joshua Rosen

M's Groundwork Flyby Tight in Midnight