Trekmates Sonoran HatDETAILS In warmer climates we prefer the Sonoran wide brimmed hat, which uses a lightweight and highly breathable Supplex Nylon to keep the head cool. A wide 7cm brim and UV rating of 40+ protects all sides of the head and neck from the sun, while a treatment on the outer fabric keeps mosquitoes and midges away. There is a discreet pocket on the brim for valuables, while a one handed drawcord adjuster at the back allows for a better, quicker fit.