Collar (neck collar) of our production is made of neoprene with a thickness of 3.5 mm. Neoprene from the inside is covered with a thick nylon and from the outside is finished with smooth rubber (smoothskin). Joint is done using a two-component glue with hardener in order to strenghten neoprene. Nylon joining is sewn with a blindstich - slanting needle does not pierce the neoprene but sews the on the surface. For this technology neoprene has a compact structure, is resistant to stretching, water does not penetrate the joint. Additionally, joining is strenghtened with a flexible neoprene glue tape. This prevents, inter alia, mechanical damage of the seam strands.