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9" Groundwork Half Tight

9" Groundwork Half Tight

M's 9" Groundwork Half Tight

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


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run everywhere guarantee
free shipping over $50
free 60 day exchanges
Formfitting, Size Chart William is 6'1" and wears size M

Amplify your run — the brand new Groundwork Half Tight is made to enhance your endurance pursuits with lightweight compression, moisture-wicking comfort, and six pockets to easily stash everything you need.

Explore more

Print Story - Spray Dye

The Spray Dye print capsule is inspired by the distinct differences of each waterway on this planet, and the greater interconnectivity they all share as a singular body.

Pocket it your way

Double-tiered side pockets can fit any size phone, nutrition, a packable windshell like our Zephyr Runner, 250ml soft-flasks or anything else you prefer to carry when going the distance

Made for smooth moves

Laser cut hems provide a seamless, smooth finish while the inseam gusset accommodates the biggest strides



All about the Groundwork
Breathable, moisture-wicking fabric with 4-way stretch provides light compression with an unnoticeable feel in stride

Softer, breathable waistband
The knit waistband with external facing drawcord allows for a secure, comfortable fit while perforations enhance breathability

Dual-layer front panel
Double layered fabric on the front keeps things secure + adds extra modesty

Pockets made for distance
Deep double-tiered side pockets can easily accommodate the largest phone sizes (plus case), nutrition + 250ml soft-flasks to provide ample carrying capacity for longer excursions

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

Back pocket duals as pass-thru
A back pocket ideal for nutrition storage can be accessed from either side or can be used as a pass-thru to secure a top or lightweight layer

Clean cut
Laser cut hems provide a seamless, smooth finish

materials + specs

Groundwork Knit
68% nylon, 32% spandex

Garment made in Vietnam

Weight 128g / 4.5oz (M’s Medium)

Fabric Callout


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


care instructions

Wash before first use on cold with like colors

Tumble dry low

Heads up — some color bleed may occur
Color bleed, especially with darker colored nylon/spandex blends, is common and could stain light colored garments if washed together.


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.


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Customer Reviews

Based on 20 reviews
Ruben Alvarez y
Wear it for: Running
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: XL
Size Purchased: XL
Running tights

Super fit and absorbs the sweat well!

Wayne M Capacillo
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
No chaffing after 100 mile ultramarathon!

Rocked these bad boys during my last 100 miler and after 25 chaffing! I have had issues with other gear chaffing my inner thighs and around the waist but not in these! They stayed in position, didn't roll up the legs and had actually usable pockets.

Sen Selvaraj
Wear it for: Running
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
Best running tights

I have been looking for a running tights for long distance running and finally found one.

Mitchell Gunderson
Great compression shorts

Perfect for wet weather. No chafing. Plenty of pocket space for everything.

Paul Sailer
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
The pockets! The pockets!

These were my first (and so far only) pair of half tights, and let me tell you, they deliver! I'd been looking to buy half tights for a while, but none had the suite of pockets I desired - until Janji debuted these.

There are 6 - count 'em 6 - pockets on these. The much-sought-after internal key pocket sits in the perfect spot so that I forget it's there while I run, but never have to worry about losing it. The side pockets are substantial and comfortable to cram stuff in - I had my phone, tissues, and mask in separate pockets AND also had plenty of room to fit my AFO singlet after taking it off halfway through. The rear pocket is pretty dang smart too. It's capable of holding multiple gels and is accessible from two sides, making it ultra-convenient to grab one mid-run. Plus, holding gel packets that close to your body warms them up enough to make them easier to get down!

Fantastic pockets aside, I found these supremely comfortable - no issues with chafing, riding up, or sliding down even with loaded pockets.

My only quibbles with these are the length and the drawstring. While the length is pretty standard for men's half tights, making them perfect for fall running, they're a bit warm for weather over 72 degrees F. I'd love to see a shorter version (seems like they could get down to a 5" inseam without sacrificing the pockets) for summer. The drawstring is a bit short in my opinion, making it a bit difficult to get tied before a run. It's a great detail - just needs a little more length!

Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: S
Size Purchased: S
Great fit and utility

These are probably my favorite shorts to run in. The pockets are great and hold my phone, keys, etc without them bouncing around - I often forget I even have anything in the pockets. The extra fabric in the front is also appreciated.

Steven Kasapi
Great running tights

They were a bit tight in first wearing, but after a few runs and washes they’ve relaxed a bit and fit well, true to size. They’re very well-constructed with contours in just the right places. Definitely a keeper.

Jef Groesbeck
They’ve become my fav

Quickly become my favorite shorts… no bunching between the legs, no chafing. In the hottest and most humid weather I may still prefer regular shorts, but for everything else until winter these are what I want to wear. Love the spray dye print. Hoping for more patterns in the future.

Jorge Enrique Gomez / G042708
Bedt shorts for Trail Running!!

I like everything about them!!
Lots of pockets and the lycra Quality is great!!

Richard H.
Comfortable and Cool

These half-tights have been great on long runs during this hot humid summer. They allow me to run chafe-free and store plenty of gels. I'm looking forward to wearing them during my next marathon.