Cooling Cap liners fit most ball caps.  Great to use in your favorite cap.  Re-activate at any time by adding a little water.  If you oversaturate just wipe the liner and place inside your ball cap or helmet.  Allow to dry thoroughly before storing.

No gels, beads or ice packs.

Signature design has a special cutout in the rear of the liner for proper alignment in your ball cap.  Slides easily under the cap rim and is discreet.