SAS TEC is viscoelastic foam with memory effect. SAS-TEC foam reacts promptly and without any time delay. The energy absorption goes linear, which keeps the impact forces to the human body at a low level. It is an adaptive absorption: the air which is embedded in the foam´s cells provokes a progressive absorption. The protector remains soft in case of slowly increasing forces; however when it comes to a fast heavy impact the resistance of the foam grows with increasing speed.