Key Product Features. Low Profile - Shallow crown for a relaxed, casual fit Stretchable Vegan Wool Twill - Premium fabric designed to replicate classic wool aesthetics Structured Front Panels - Full buckram construction delivers a firm, defined shape that holds its form Seamed Front Panels - Provide durability and a stable surface for your artwork 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