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Good footwear is essential to all sports. Whether the movement is forwards or in multiple directions, the forces generated by the legs are transferred to the ground by the feet to bring about motion. Any slipping of the foot inside the shoe or instability of the foot or shoe itself will result in unnecessary movement which will use up precious energy and so decrease speed and power of movement. Not only will performance be affected, but this instability can pose a risk of injury. One of the focuses of ASICS shoes is therefore stability. Innovations such as the Trusstic System, DuoMax and Personal Heel Fit all help to provide natural gait. ASICS however has long recognised the perfect design of the human foot. The Biomorphic design of the ASICS shoes allows the upper to move in the same way as the foot. These make the shoes very comfortable and feel almost like a second skin. Ultimately, shoe should not be an extension of the foot, but be part of the foot.
The lightest of the series yet, the GEL-KINSEI 4 is ASICS’ flagship performance running shoe, featuring many ASICS’ advanced technologies. Among those technologies, the GEL-KINSEI 4 offers the serious runner more stability and better shock absorption in the heel area through more localised GEL Cushioning in independent units, while a new Personal Heel Fit System improves durability and comfort. The Full Length Guidance Line gives a smooth heel to toe action for more efficient running that wastes less energy and delays the onset of fatigue. A lighter, longer Trusstic System reduces weight, increases flexibility and increases the efficiency of the transfer from heel strike to toe-off. The full length Solyte 45 lasting technology increases cushioning, resulting in improved comfort levels. By lowering the Rearfoot and Forefoot midsole section by 1mm, a more stable base and more responsive ride can be enjoyed, while the minimal use of non-elastic materials at the toe vamp results in seamless structural integrity and improved fit and comfort. They all help to make the GEL KINSEI 4 the most cushioned, most comfortable ride ever.
The ASICS GEL cushioning system is a key component in meeting the needs of runners, both recreational and professional. When running, the foot can typically experience forces of 3 to 5 times the runners body weight during heel strike. The GEL cushioning system, in conjunction with the midsole material and construction, absorbs the impact forces. In combination with the GEL, there are also grooves in the rear foot which help stabilise the foot during heel contact. The ASICS GEL cushioning system has been developed in many densities and shapes in order to meet the specific needs of the individual runner.
PHF or Personal Heel Fit, is made of a high density foam which moulds perfectly around the shape of the heel and Achilles tendon, therefore decreasing the slippage and improving the comfort and fit. PHF adjusts to the differences in individual heel shape and structure, thereby providing improved comfort and fit. This is achieved through a special high density, self-moulding foam that hugs the contour of the heel, but rebounds to its original shape when not in use. Each time an athlete slips his or her shoe on, the PHF will adjust to hug the heel, providing customised comfort for each use.
The ASICS Propulsion Trusstic System mirrors the functions of the ligaments in the foot. It helps the foot transform from a flexible structure, for shock absorption through heel strike and mid-stance, into a powerful rigid lever needed for forward propulsion. This reduces pressure from the sole of the foot and produces a more natural movement. Less pressure means less strain, which in turn leads to a reduced risk of injury and greater comfort.
By bringing together all of the most advanced ASICS technologies, I.G.S – Impact Guidance System – embraces cushioning, stability and flexibility. The objective of the I.G.S concept is to ensure that the individual shoe components and technologies work together as effectively as the parts of the human foot.
Eight factors are taken into consideration when developing an I.G.S shoe. These are flexibility, lightweight, cushioning, stability, breathability, grip, fitting and durability. The overall result of applying the I.G.S concept is a smoother, more comfortable step, an improved gait and a more enjoyable run.
The Guidance Line places a visible groove in the mid and outsole that follows the foot's centre of pressure from heel to toe. The result is a more adaptive running platform, creating a smoother transition from heel strike to toe-off with each stride. The Guidance Line thus helps runners to maintain a natural, efficient gait, especially over long distances.