Every marathoner knows Heartbreak Hill by feel before they know it by name.

The M-Heartbreak is a limited edition REPREVE running cap in blue, named for the climb. REPREVE uses 100% recycled yarns in place of first-use polyester, keeping the build light and breathable for the training that gets you there, not just race day.

• REPREVE recycled fibre: replaces first-use polyester, cuts waste-water and crude oil use, and keeps the build light and breathable
• Pliable peak: folds flat for the bag, holds its shape when it's out
• Quick-adjust rear strap: sized to sit secure on a smaller head or a larger one, so fit isn't a guess before you buy

See more M-Series running caps here, part of our wider running caps range.