The Zox polo sport is a lightweight, narrow profile half helmet that's great for motorcycle riders who want to feel free in the breeze. The advance fiberglass composite shell gives you the ability to wear a 2 pound helmet while still maintaining the safety of a motorcycle half helmet.; AFCS Advanced fiberglass composite shell 2 Shell sizes to ensure good fit XS-S, M-2XL EPS liner system for narrower profile shell Net weight: 2.00 lbs. DOT Approved