The cut of the X-O cap is perfect. It doesn’t ride, it doesn’t wrinkle. It’s not completely over my ears, so I can hear." - Michael Phelps
Engineered with integrated, dual-density stretch zones, stabilizing ribs, and internal dimpling, the X-O cap offers a sleek and secure fit. The Compression cap is designed to be worn under the X-O to help with hair management for better fit and improved hydrodynamic shape.