In case you didn't already know it, e9 stands for emergency nine. These really cool trucker style hats have a soft mesh backing with a snap back closure and are manufactured by our friends at Imperial Headwear. 

The red square "emergency nine" patch measures 2.25" x 1.5" 

Glacier Ice Blue Performance White Mesh Back

• Performance poly fabric mesh back cap
• Lightweight, breathable and moisture wicking
• Mid structure profile
• Plastic snap closure

 Navy Cotton Tan Mesh Back 

• Garment washed cotton twill front and ultra-soft polyester mesh back
• Structured mid-crown profile
• Plastic snap closure