On Women's Core Running Pants - Black, Size M

Hit the pavement, the gym, or the trail in the On Women's Core Running Pants. Cut for an athletic fit and built from a technical stretch fabric made with 86% recycled polyester, these pants move with you through every stride, squat, and stretch. The elastic waistband with adjustable drawstring lets you dial in the fit, while the tapered leg keeps the silhouette streamlined and free of excess fabric. A zippered side pocket secures your keys or card, and a second open pocket gives you quick access to your phone or gels. Reflective details help you stay visible when your run stretches into low light, and the moisture-wicking, quick-drying fabric keeps you dry from warm-up to cool-down.

Key specifications

• Gender: Women's
• Activity: Running, training, everyday wear
• Material: 86% recycled polyester, 14% elastane
• Fit: Athletic, tapered leg
• Waistband: Elastic with adjustable drawstring
• Pockets: 2 side pockets (one zippered)
• Fabric technology: 4-way stretch, moisture-wicking, quick-drying, breathable
• Reflective elements: Yes
• Colour: Black
• Size: M (Medium)
• Sustainability: Made with recycled materials
• Care: Machine wash cold, do not bleach, tumble dry low, do not iron, do not dry clean

Why choose it

These pants are a versatile workhorse for any active wardrobe. The recycled polyester blend offers just the right amount of stretch and support, while the quick-drying finish keeps you comfortable through intense intervals or unexpected weather. The zippered pocket is a thoughtful touch for runners who don't want to carry a belt, and the reflective accents add a layer of safety for early morning or evening sessions. Plus, the sleek black colour pairs effortlessly with any top or jacket.

Ideal use cases

• Road running and trail running
• Gym workouts and strength training
• Yoga, Pilates, and stretching sessions
• Travel and everyday athleisure wear
• Cool-weather layering under a shell

Good to know

The Core Pants are designed with sustainability in mind, using recycled materials without compromising performance. The pull-on closure means no zippers or buttons to chafe, and the tapered leg works well with both running shoes and casual sneakers. For best results, machine wash cold and lay flat or tumble dry low to maintain the fabric's stretch and shape.