Abstract: A sports helmet has a resilient, cushioned lining in the interior having at least one pocket in a rear portion containing an air-activated heat-generating element. The helmet is fabricated with an adjustable interior lining having a plurality of pieces which fit into the interior of the helmet shell. A nose and mouth-covering portion of the lining is constructed from two separate lining members having a plurality of strategically located hook-and-listeners which enable the lining interior to be custom shaped to fit the face of each wearer. The lining members form a conduit to side vents in the helmet, thereby preventing exhalation from fogging the transparent face shield of the helmet.