A Cap is the smallest Helm.
Normal Helms — Cap • Skull Cap • Helm • Full Helm • Great Helm • Mask • Crown • Bone Helm
Exceptional Helms — War Hat • Sallet • Casque • Basinet • Winged Helm • Death Mask • Grand Crown • Grim Helm
Elite Helms — Shako • Hydraskull • Armet • Giant Conch • Spired Helm • Demonhead • Corona • Bone Visage