This is the Petzl SIROCCO climbing helmet. Features: An ultra-lightweight helmet designed for climbing and mountaineering. It weighs only 160g in size S/M, making it extremely light. Construction: It uses a hybrid construction of EPP foam (shell), polycarbonate (crown), and EPS foam (liner), balancing light weight and protective performance. Protection: Designed based on Petzl's proprietary "TOP AND SIDE PROTECTION" standard, it provides high protection against impacts from the front, sides, and rear. Comfort: It is thin, highly breathable, and offers excellent fit. (Quoted) Size: S/M I purchased this and stored it at home in its bag without using it. There is no box. I am selling it to organize my belongings. Please understand that there may be oversights. I would appreciate it if you could understand that this is a home-stored item. I will ship it via either Yu-Yu or Rakuraku Mercari delivery service.