The present invention is an hat for cooling the head of a wearer having a chamber comprising a central cavity and at least one opening for placing ice into the cavity; and at least one porous member secured to one end of said chamber; wherein the apparatus is configured to be demountably attached to the head of a wearer. An air valve allows the fender to retain either an uncompressed state to act as a fender or a compressed state for easy storage. The adsorbing step and decomposing step are conducted after the reducing step. The FPGA may also monitor host memory and provide encryption and decryption functionality.