At its centre: a proprietary bottle design, co-developed with Hydrapak and contoured to arc cleanly around the torso. Both men’s and women’s variants follow this anatomical logic - stabilising the load while preserving chest space for airflow and mobility. The women’s system goes further, reshaping and repositioning the bottles to sit beside the bust, easing pressure, maintaining hold. A fit that conforms, controls, and disappears at speed.

Zoned across the chassis: three technical fabrics. Quad-axial mesh through the shoulders and spine anchors the system with breathability and torsional hold. A Dyneema blend across the front resists distortion under strain. French-woven stretch along the sides flexes without slack. Every seam maps to motion. Held by tensioned cords - not compression - it contours without sag, rub, or mid-race shift.

Storage is embedded in the chassis - eight pockets, zoned for speed, balance, and intuitive access. Zipped torso compartments house the bottles. Fuel and nutrition ride at the sides. A zipped chest pocket secures valuables. At the rear: a zipped pocket for essentials, plus a stretch compartment for jacket or bulk - all integrated to preserve line and movement.

Pole loops at shoulder and hip. Bonded edges. Reflective trims.

Designed around the runner. Built to vanish.