When equipment for head protection is combined with that for hearing protection, the head band of ear muffs may prove incompatible. For a combination of equipment for head protection and hearing protection, ear muffs attached to the industrial helmet can be used (DGUV Regel 112-194 (to date: BGR/GUV-R 194), governing the use of hearing protection, January 2015, Sections 3.1.3.1.3, 3.2.1.2.2, 3.2.1.6 and 3.3.12 at www.dguv.de/fb-psa, in German). Helmet straps might break the seal of the attached earmuffs if they were not designed to be compatible.