Which t-shirt should I wear for winter running?

Wear a long-sleeved top next to the skin: the BAUGES LS (110 g) in cool weather, or the ALBAN (210 g) or ARGENTIERES (240 g, zip neck) when it's cold. For winter trail running and ski touring, the SEAMLESS HOODIE TOP adds a hood that converts into a balaclava.

Vest or t-shirt for trail running?

A vest leaves your arms and shoulders exposed for better ventilation: the 75 g FAURIO is designed for short, intense summer outings. On a long run with a pack, a lightweight t-shirt like the EIGER (80 g) feels unobtrusive beneath the shoulder straps.

How can I prevent chafing when running?

Choose a top with flat seams or no seams, worn next to the skin in your usual size: the TEAM LS has flatlock seams, while the SEAMLESS tops have no seams. A close fit, like the GRIMPEUR PEI's, prevents fabric from bunching beneath your pack straps.