Bring that Mariners home-run energy to your everyday look with the New Era Mariners 9FORTY A-Frame Leaves Cap. Crafted from 100% polyester, this baseball cap brings a lightweight, comfy fit paired with dependable durability you can count on. Gear up like a franchise player with the New Era Mariners 9FORTY A-Frame Leaves Cap. Part of the 9FORTY A-Frame Leaves Camo collection. 100% polyester.