A protective hat for children and adults comprises a head-enveloping member constructed of a core of impact absorbent foam, encapsulated within a shell of textile fabric material, the textile fabric material providing the inner and outer surfaces of the hat. The core is so constructed as to provide for conformity to the shape of head of the wearer, and to allow for ventilation. The bulk and density of the foam core is such that, in sizes for children, the hat provides significant buoyancy.