Demon Hyper X Top D3O V2 Protective Vest Optimal protection - X-TREME SPORTS HYBRID Lightweight, PE armor plate sandwiched between two layers of base memory foam giving maximum shock absorption and puncture resistance D3O shoulder caps, Neck brace compatible Chest and spine ventilating system SIZE: XS (32-34), SM (34-36), MED (36-39), LRG (40-43), XL (44-47), XXL (48-50)