Named after the terrain, not a marketing team.

The S-Heartwood is Fractel's Coolcore Breeze singlet in yellow, a recycled mesh with chemical-free thermoregulating threads for sweat-wicking breathability when the pace picks up. Four-way stretch is tailored for a natural stride, cutting the risk of chafe over distance, finished in a limited edition Sierra Nevada print.

• Coolcore Breeze recycled mesh: chemical-free thermoregulating threads wick sweat and manage heat as the pace lifts
• Four-way stretch, tailored for a natural stride: cuts the risk of chafe over distance
• Reflective details: added visibility at dawn, dusk or low light

Explore more of our womens running singlets lineup, part of our wider Running Singlets collection. This one also belongs to the Sierra Nevada Collection.