Ultimate Leather Apparel Inc (Ultimate Leather) is recalling certain Zone HS1100 helmets manufactured 2014-2016, models HS1100-D1, HS1100-D2, HS1100-D3, HS1100-D5, HS1100-FLAT, HS1100-REBEL and HS1100-SHINY, in sizes XS, S, M, L, XL, and 2XL. The helmets may not adequately protect the wearer in the event of a head impact during a crash. As such, the helmets fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 218, “Motorcycle Helmets.”