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(OFF)ROAD > Bottoms > Groundwork Flyby Tight

M's Groundwork Flyby Tight in Midnight

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

Regular price $88
Unit price  per 
  • Color Midnight

    Color Midnight

    Color Midnight

    Color Midnight

  • Astral

M's Groundwork Flyby Tight in Midnight

Aron wears size M and is 5'11" Formfitting, 28.5" inseam, 
Size Chart

Sustainable materials, responsibly made. Learn More

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

Groundwork Knit
68% nylon, 32% spandex

243g / 8.6oz (M’s Medium)

Garment made in Vietnam


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 14 reviews
Best Tights Ever
Comfortable and warm
Best running tights out there
Great tights
Love it!!!