Summer’s sun invites us to hike. It brings blue skies, longer days – and the realities of heat and damaging rays. The Sima is your shield. Ultralight, easily packed, and exceptionally breathable, it stays cool on hot days while delivering UPF 50 protection. 100% recycled Diem™ stretch polyester dries fast and feels soft on your skin. A gill vent at the back increases airflow, the tall collar extends protection, and the jacket stuffs into its side pocket for easy transport.