Lightweight, durable polyethylene shell . Dual-density foam padding, just like what the BIG Boys wear . Inside cantilever strap . Cloth neck lining, won"t scratch . Breathable mesh pad covering . Removable padding for machine washing (gentle cycle) . Pre-drilled for accessory attachment . Available in various sizes . Extra Extra Small (XXS): 45-60 lbs. . Extra Small (XS): 50-70 lbs. . Small: 60-80 lbs. . Medium: 70-100 lbs. . Large: 90-120 lbs. . Extra Large (XL): 120-150 lbs.