Classic trucker style with a fitted comfort upgrade. The 135-2 OTTO FLEX trucker hat offers a secure stretch fit, breathable mesh back, and relaxed low-profile shape for everyday wear that feels easy from the start., Key Product Features. Cotton Blend Twill - Combines breathable comfort, long-lasting durability, and a soft feel Low Profile - Shallow crown for a relaxed, casual fit Stretch Mesh Back - Enhanced airflow and light stretch for a cool, comfortable fit Enclosed Back - Clean, fitted design for a streamlined look OTTO FLEX Stretchable Sweatband - A snug, flexible fit with antibacterial, anti-odor and moisture wicking properties