O3Performance T-Shirt
O3 — S-S 2026

Performance T-Shirt

CHF 67

The O3 Performance T-Shirt is designed for movement without compromising on style. Crafted from a lightweight performance blend incorporating COOLMAX® fiber technology, it helps wick moisture away from the body to support a cool, dry and comfortable feel through every training session, while the refined athletic fit moves effortlessly into everyday wear.

Size
Shipping options shown at checkout
14-day returns on eligible items
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Description+

The O3 Performance T-Shirt is designed for movement without compromising on style.

Crafted from a lightweight performance blend incorporating COOLMAX® fiber technology, it helps wick moisture away from the body to support a cool, dry and comfortable feel through every training session, while the refined athletic fit moves effortlessly into everyday wear.

Finished with a signature flat reflective O3 logo, it's the foundation of the collection — timeless, versatile and understated.

Built Through Discipline. Run Your Own Race.

Features

  • Lightweight performance blend
  • COOLMAX® fiber technology for moisture-wicking comfort
  • 39% polyester / 27.5% cotton / 27.5% modal / 6% elastane
  • Athletic fit
  • Raglan sleeve construction
  • Flat reflective O3 logo
  • Reflective detailing
  • Designed for training & everyday wear
Size & Fit+

Athletic training fit in a four-way stretch performance knit. Fits true to size. If between sizes, size up for a roomier fit.

Model is 182cm and is wearing a size XL.

Delivery & Returns+

Shipping options and delivery charges are shown at checkout.

Shipping options and delivery charges are shown at checkout. Eligible items can be returned within 14 days in line with our Return & Refund Policy.

Size Guide

Performance T-Shirt

Garment measurements taken with the product laid flat.

MeasurementSMLXL
Body length68707274
Chest width (1/2)50525456
Sleeve length3435.53738.5
Hem width (1/2)48505254

Choosing your size

For the most accurate comparison, measure a similar garment you already own while it is laid flat. If you sit between two measurements, choose the larger size for a roomier fit.

Measurement note

“1/2” measurements are taken straight across the garment, not around the body. Small variations may occur due to normal manufacturing tolerance.

Complete the look.

O3 Performance Shorts, ObsidianO3 Performance Shorts, AubergineO3 Performance Shorts, Cream Ivory
CHF 62
Cream Ivory

Shorts Cream Ivory · S

View the Performance Shorts