Festi'trail Marzens begins at the Place de la Mairie in Marzens, a village in the Tarn department of southwest France. It is a morning trail-running event offering three race distances: 19.8 km, 12 km, and 7.4 km. Hikers and Nordic walkers can also participate on 12 km and 7.4 km routes.
The event gathers trail runners, hikers, and Nordic walkers. Timing is managed by Chrono-start, and online registration is available for the routes and the post-race meal. One euro from each entry supports the Ligue contre le cancer - Comité du Tarn, linking the day's activities to a local charity.