Resistance of the Upper/Sole Bond
SAWA shoes feature a glued and stitched sole. The bond is considered complete.
The sole stitching is made with waterproof nylon thread.
Flex Resistance
The shoe is bent at a 90-degree angle to determine the sole’s flex point. A notch is made at the flex point. Then, the shoe is flexed 30,000 times.
After this test, it is observed whether the notch has increased. The notch did not increase at all, which proves that SAWA shoes are resistant to bending.
Abrasion Resistance
The shoe’s sole is rubbed against a 40-meter abrasive strip. A good-quality sole loses 250 mm³ of volume after this test. In the case of SAWA soles, they lose only 79 mm³ of volume.
SAWA’s abrasion resistance is therefore three times higher than average.
Tear Resistance
Tear resistance: several perforations are made on the upper part of the shoe. Pressure is applied to the perforations until they widen.
In the footwear industry, perforations begin to widen under a pressure of 3.5 deca-newtons. For SAWA shoes, a pressure of 7.6 deca-newtons is required to start widening the perforations, which proves that SAWA shoes have tear resistance twice as high as the average.