 These helmets are used for urban search and rescue, technical rescue, and medical rescue applications and are shaped differently from traditional fire helmets.Most designs are derived from them, but feature a lower profile and elimination of excess protective area to facilitate better freedom of movement for the head in confined spaces.Those derived from North American-style helmets often appear to be similar to a commercial hard hat, while those derived from European styles such as the F1 appear more similar to rock climbing helmets.