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Developed in partnership with Michael Phelps and coach Bob Bowman the X-O competition swim cap is engineered with integrated, dual-density stretch zones, stabilizing ribs, and internal dimpling, the X-O cap offers a sleek and secure fit. Featuring our EXO-core technology this competitive swim cap combines two thicknesses of silicone for maximum performance. Internal dimpling and stabilizing ribs prevent movement and wrinkling and keeps the cap in place. Latex-free and designed in Italy the X-O competitive swim cap is fine approved and comes with a reusable hard case packaging. Pair with the compression cap to improve the hydrodynamic shape of the head and hair. Cap is available in multiple colors.