EO 101. This is the fundamental headgear for extreme outdoor conditions. This hat is manufactured from water repellent breathable and lightweight microfibre. The hat features a neck cape for sun protection, which can easily be tucked underneath the crown. There is a clip and cord system built into the hat that attaches to your collar to prevent the hat from blowing away. For sizing, there is a cord with barrel lock closure. The Extreme Outdoor is the exceptional hat that will take you to the limits.