Each sleeve consists of trauma pads and anti-spall layers. This sleeve is unique in its design as it is constructed in one piece to capture the spalling effect from projectiles if a projectile hits the enclosed steel armor plate. These sleeves provide the wearer multi-level protection all in one convenient and lightweight package. These sleeves are constructed of 5 layers of Kevlar with a 10mm thick trauma pad enclosed with 1000D Polyester fabric, making it one of the toughest sleeves on the market!