SAS-TEC MEN'S BACK ARMOR LEVEL 2Viscoelastic memory foam: after an impact or deformation of the foam, the protector will quickly revert to its original shape Multiple impact compliance: even if the same area of the protector receives repeated impacts, the protector maintains if fully functional capability Adaptive absorption: the air within the cells of the protector allow progressive absorption of energy as the material becomes more firm as it compresses Climate stability: SAS Tec