Free shipping on all orders $40+

Holiday questions?


M's Groundwork Flyby Tight in Astral

Regular price $88
Unit price  per 

Sustainable materials, responsibly made.

  • Midnight

  • Color Astral

    Color Astral

  • Color Astral

    Color Astral

M's Groundwork Flyby Tight in Astral

Only 4 left in stock!

Aron wears size M and is 5'11" Formfitting, 28.5" inseam
Size Chart
Complete the look with the M's Swift Tech Mockneck LS

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

behind the design

behind the design


Durable nylon

Hi-vis reflectivity



The updated Flyby Tight features hi-vis reflective taping along the side seams, a dual-lined front-panel for extra wind-blocking warmth and security where it's needed most, and four roomy pockets for all your carrying needs. Built from a durable stretch nylon that resists odors and won't sag-out during serious efforts, these tights are designed to minimize distractions and provide an unfussy, streamlined fit.



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

materials + specs

Groundwork Knit
68% nylon, 32% spandex

243g / 8.6oz (M’s Medium)

Garment made in Vietnam

Fabric Callout

Fabric Callout


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

Shop All groundwork



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.

Customer Reviews

Based on 49 reviews
I've stopped checking

I'll let you know how I like them if the ever get here. Was supposed to be here on the 16th, has been delayed since then with no updates from usps.

My wife and I love them

Love them, they feel really sleek. Plus my wife loves how they look!


Un gran funcionamiento del producto..

Great Product

I mean even though the size I got was too small, the tights are great. I know my brother is enjoying them a lot right now since they fit him. I’ll be able to give better feedback when I get a larger size. Looking forward to wearing more of your clothes!

Improvement over the last version!

Loved the last version of this and it looks like it's even better now. The design is less loud and the pass through pocket on the back no longer has zippers, which caught the clothing you'd loop through it. Perfect for a cold day!