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The size of loadings directly depends on duration and speed of movement, i.e. the amortization helps the sportsmen to lower size of loading, and the fans rescues from weariness.  The  sole
 should extinguish and absorb impacts about a ground and accordingly reduce loading on a backbone. Moreover the insole  should provide return of energy.
The amortization happens passive and active. Such component  as an intermediate sole concerns to first. Is soft, white, elastic foam, which became the integral part of sports footwear. Sometimes material for manufacturing intermediate soles  but most often is used plastic, which is easier and it is more effective, than rubber , though loses to him in durability.
With growth of loadings, it is impossible simply to increase thickness of an innersole. Therefore DSW shoes store began to conduct searches of additional amortization materials and technologies. In result were developed new way of  technology, which can be divided into two groups: gas (air) and micro porous.
The gas shock-absorbers are more comfortable and are stable, facilitate footwear, but are more expensive in manufacturing and be requiring to a surface and are unsafe at lateral movements, and at rough statement stops on a support can be

 " back  effect ". For this purpose some companies  the air shock-absorber as a rule is inside an innersole, not having direct contact to a surface.
The micro porous shock-absorbers well absorb loading, quickly accept the initial form after compression, but are not durable. After trainings lose up to 40 % of amortization properties, seem by more rigid, but are not afraid of damages and are steady. The features of sports footwear are those, that forward, more thin part does not allow to insert effective gas "pillow, therefore there are combined variants. As a rule, under middle stops the micro porous shock-absorber, and under top air "pillow" settles down.
The active amortization is strengthened by technologies Puma, Adidas Torsion, New Balance Stability, Asics Tactic. In all cases the speech goes about a plastic design,  in an innersole,  is direct under stops. Without dependence from design and color of this element, he is engaged by "secure" of the sportsman at the moment of purchase  from year  to year. Therefore it also looks nice :  the arch form dividing a sole into a forward part and "heel". To check up quality of the soil it is possible through the simple test - having rested time between palms, to reduce hands - sole should be bent in a forward third, there where she would be bent. Thus if to take time for rest and relaxation , and to bend strong, the plastic element owes  is elastic to be bent and to spring, thus demonstrating future "job" on legs.
Is very important, both for the sportsman, and for the fan, as protects footwear  from damages, or even falls. For stability, as a rule, is used more strong materials of double density or plastic insert from the interior of a sole. It in addition is an excellent preventive means against stain , as distributes a centre of gravity on some basic elements.