Core-T Tee

Verified claims

Fit and crossover

Regular, never-clingy fit works as both a running tee and an everyday layer.

Breathability

Full-body micro-perforation provides uniform cooling and faster evaporation.

Weight

Micro-perforation saves weight versus heavy mesh ventilation panels.

Moisture management

Microfibre fibres wick sweat and micro-perforations accelerate evaporation.

Stretch

Loop geometry provides stretch that snaps back without sagging.

Softness

The jersey feels soft and smooth, avoiding rough synthetic feel.

Competitive pricing

At 80 CAD, the Core-T is On's most affordable technical tee, undercutting the $80 Performance-T.

Recycled polyester

92% recycled polyester/8% spandex matches top competitors and cuts carbon emissions ~30%.

Performance

Retains breathability, moisture-wicking, and durability despite recycled polyester construction.

Positioning

Marketed as an everyday running staple with all-season versatility, sustained by recycled material.

Versatility

Designed for year-round use, fits as standalone or base layer.

Care instructions

Machine wash cold, tumble dry low; avoid fabric softeners.

Abrasion resistance

Microfibre jersey is inherently abrasion-resistant, reducing fraying and thinning.

Shape retention

Microfibre jersey retains shape after washing, preventing sag.

Product record

Title

Core-T Tee

Brand

On

Price

80 CAD

Availability

In stock

How the Core-T stacks up to competitors

• Built with recycled polyester, the Core-T matches the sustainability promise of the Patagonia Capilene Cool Daily (100% recycled) and the rabbit EZ Tee (94% recycled) while sitting in the same sub-$60 price band — a signal that eco-conscious materials no longer command a premium surcharge in the running shirt segment.
• The Core-T's $59.99 USD price places it squarely between the $50 Patagonia Capilene Cool Daily and the $70 Tracksmith Twilight Tee, while undercutting On's own $80 Performance-T — a sweet spot that buys into the Swiss brand's running aesthetic at a lower entry fee than most of its technical competitors.
• The Core-T's regular, never-clingy fit — described by On as a classic comfortable cut — differs from the body-conforming trim of the Tracksmith Twilight Tee ($70) and many race-oriented tops, offering a more accessible silhouette that doubles as casual wear, a versatility that mirrors the Patagonia Capilene Cool Daily's forgiving drape and helps justify the $60 outlay as an all-day piece rather than workout-only gear.

How micro-perforations boost airflow

• Each micro‑perforation functions as a direct exit for sweat vapor, so the moisture‑wicking jersey dries faster than it could through surface evaporation alone — you stay drier during threshold efforts and avoid that clingy, saturated feel.
• Because the cooling comes from the fabric itself rather than added mesh panels, the tee remains exceptionally lightweight — the micro‑perforated construction saves grams that matter during fast running or racing.
• Rather than limiting ventilation to underarm and back panels, the Core‑T perforates the entire jersey, resulting in an even distribution of airflow that avoids the localized dampness common with targeted vent shirts.
• A published ergonomics study demonstrated that small ventilation holes in a T‑shirt can significantly lower both thermal insulation and moisture vapor resistance during movement — for the Core‑T, that translates into a measurable head‑start on staying cool when you pick up the pace.

What stretch microfibre jersey offers

• Microfibre fabrics are inherently resistant to abrasion because the ultra-fine polyester threads pack densely, reducing fraying and thinning through repeated machine washes — for the Core-T, that means it maintains its smooth finish and color saturation far longer than a typical cotton or non-microfibre active tee.
• On labels the Core-T as 'Any climate' gear and explicitly states it's engineered for all seasons — the microfibre jersey balances breathability and light thermal retention, keeping you cool in summer heat but warm enough under a shell in autumn, effectively covering the full training calendar in one shirt.
• Microfibre jersey knits typically deliver moderate, lasting stretch — the Core-T relies on loop geometry rather than high elastane content to provide give, so it moves freely with lunges, overhead reaches, and sprints yet snaps back to its original shape wash after wash without the progressive sag of elastane-heavy tops.
• The Core-T's microfibre jersey is woven from recycled polyester — confirmed on On's own product page — reducing reliance on virgin petroleum, cutting carbon emissions by an estimated 30% versus conventional polyester, and diverting post-consumer plastic from oceans, turning each run into a small sustainability win.
• With individual fibers measuring less than 10 micrometers — finer than silk — the jersey's enormous internal surface area pulls sweat off the skin and spreads it for rapid evaporation, keeping the shirt perceptibly drier during tempo runs and interval sessions than even standard polyester workout tees.