Abstract: A cap or hat having a pocket accessible from the inside or outside of the cap or hat for holding a cold or hot gel pouch. The pocket has a top layer of a top outer ply and a top inner ply where the top inner ply has UV rays reflecting properties and a bottom layer of at least one ply where the bottom layer is a layer of insulation that partially insulated the cold or heat from the gel pouch from the head of a person wearing the cap. To accommodate the pocket which is provided to hold a soft sided gel pack that is especially designed to conform to the upper part of the wearers head, the cap has an extra deep dome which is obtained by providing side panels of the cap which are longer than the side panels of a prior art baseball type of cap.