Riding helmet with MIPS, a technology that mimics the brain's natural safety system. When the head is subjected to angled impact, this system allows the brain to move in the cerebrospinal fluid, which reduces trauma to the brain. The MIPS system has an integrated low-friction liner that can absorb part of the energy that could otherwise cause brain damage in the event of angled impact. Removable and washable lining. Adjustable with one button at back. S: 52-54 cm. M: 55-57 cm. L: 58-60 cm. PU chin strap.