Thor Sentinel Youth Chest Protector White. The Sentinel is the most versatile, best fitting, lightest roost protector we′ve ever built. Weighing in at only 1.4 lbs., the Sentinel incorporates numerous vents and air channels for maximum ventilation. Designed for riders who are looking for roost coverage without the bulk and excess weight, the Sentinel is pure performance. We′ve included both the back strap and number plate with every Sentinel, so your ready to go racing right out of the box. FIts most riders 120-200 lbs.