Norrona Senja Flex1 9" Shorts are designed for trail running, but can be used for all warm weather activities. Norrona Senja Flex1 9" Shorts are designed for trail running, but can be used for all warm weather activities. Norrona uses a 106 g/m2 light and breathable flex1 fabric for these shorts because it provides comfort, breathability, quick dry and great movement. The fabric is made with 86% recycled 20D 6 nylon, and 14% elastane. Key features include: A zippered pocket in the back for your valuables, two open hand pockets, four side pockets to store energy bars or gel, one with a key hook inside. There is also a concealed tunnel at the back of the waist to attach any extra layers of clothing. Comfortable waist elastic with cord tightening. These shorts have a regular fit with no restriction of movement.