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While the  Cheap nike dunk sb shoes, but the basic principle is generally connected. Its primary function is to absorb the shock from the ground. When people run speed of 6 meters per second, the feet bear the weight of the load is about 4 times, jumping when the increase was 7 times, triple jump two feet directly, and hard collisions, the peak impact force can be weight up to 20 times, a strong oscillation will spread to the ankle, knee, hip, spine and brain which. Thanks to our heels natural fat pad and the "spring system" effectively resist the arch of this injury. Modern sports shoes Cheap dunk sb shoes  will be a kind of high "pressure compliance performance" of the material placed in the heel and let it through their own shock absorption maximum amount of kinetic energy of deformation. Also some sports shoes will be the end result of "waffle" shape, and some placed in the sole and the cushion rubber column, under the chassis to play the role of shock absorber spring.
When the basketball players caught up into the sky, when track and field athletes at the foot of wind, a pair of good shoes will be as gratified two small "motor." The second function of Cheap dunk sb is back lost energy. Feet and other parts of the porous polyurethane foam is highly elastic, soles restore the compressive deformation, can absorb and release the stored energy back to feet. Cycle of strides in the process, just like a mini-marching "springboard" for the. Here the essence of technology is the flexibility and stability in the shoe to find a balance between, it is necessary to get a good recoil, accuracy can not lose the sense of space and "down to earth," the hard support. 

High friction coefficient and high elongation of the soles to the ground in the concave elastic deformation produced increased contact surface, this is the so-called "grip." Insertion of metal studs in the past, pulled between the ground will consume energy, modern studs Nylon, polyurethane and other composite materials, conical, rectangular, blade-shaped and so numerous, the number and location of spikes also able for people to adjust and change from place to place. Has a large array of different sneakers instead of spikes suddenly ridge. The sole pattern is changing, bringing different friction in different directions to meet the needs of different types of sports. It is worth recalling that, in exercise of the "brake" process is a dynamic friction to static friction, the foot falls to the ground there should be some "sliding schedule", if the shoe large friction force to a landing on the moving, it is easy to Wei feet and sprained.