Lightweight and all-round helmets with enveloping shell that reduces the space during use. Main characteristics: provided with professional head lamp clips and slots for hearing protections with quick hooking (e.g. 3M-Peltor, Sperian); lightweight shell made of ABS and liner in expanded polystyrene; comfortable foam with absorbent and washable fabric; chin strap designed to limit risk of losing helmet during a fall (strength greater than 50 daN); chin strap designed to limit risk of losing helmet during a fall (strength greater than 50 daN); developed for tree climbing and rescue; compatible with Visor G in PC with scratch and fog resistant treatment, transparent