Engineered with integrated, dual-density stretch zones, stabilizing ribs, and internal dimpling, the X-O cap offers a sleek and secure fit.
"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
"The swim cap is very important to a swimmer's performance. We've created a cap that's going to provide maximum control of the hair with a minimum wrinkles for the most streamlined movement through the water." - Coach Bob Bowman