From Nike Plus, the Filament running capris feature:

• UV protective Dri-FIT jersey
• excellent support and optimal range for motion throughout your run
• curvy lines for a modern look
• contrast-color insets
• elastic waistband with internal Nike Running drawcord
• center back zip pocket
• Swoosh™ design at left thigh
• polyester/spandex body; recycled polyester/spandex contrast panel
• machine wash