Key Product Features. Low Profile - Shallow crown for a relaxed, casual fit Performance Ottoman Polyester - Distinct ribbed weave with a modern performance upgrade Stretchable Performance Fit - Flexible construction moves with you for all-day comfort Cooling Comfort Technology - Breathable, moisture-wicking polyester for active comfort 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