






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
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Kit Out
behind the design
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.
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 |
Weight 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 GROUNDWORKsustainability
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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