Metal helmet of the head in the armor of the Knights of the middle ages. It was used in battle and then also in competitions and tournaments with his helmet, mobile element, with holes for vision, covering the face. When an object does not have antonyms. Helms, two mountain peaks with this form, one in the pedriza, in the sierra de Guadarrama, called also Peña of the tithe and the other in the sierra de Segura, in the province of Jaén, are also called adapted for paragliding.