In the wearing test of three kinds of shoes (made of natural leather, synthetic leather, and artificial leather), the accumulation behavior of sweats in the shoes and socks and its relationship to the shoe material used were examined. A large difference has been observed in sweat accumulation among individual subjects. Such a difference is probably attributable to a large influence from the subject, and test condition including the weather, the quantity of motion, an age group, body condition of subjects, and the type of ingestion. Comparing the sweat accumulation in shoes after the wearing among its material, accumulation level in socks was higher for synthetic leather shoes than for natural or artificial leather shoes. This was probably assumed that the sweat secreted from the human body was directly absorbed in socks with no retention by the synthetic shoe material that is a typical non-absorptive polyvinyl sheet.
The shear vibration of polyester filament and cotton spun fabrics was measured precisely and the effects of weave density and yarn twist on the shear vibrational properties of fabrics were investigated by gray relationship analysis. It was shown that the damping ratio of the shear vibration of polyester filament and cotton spun fabrics both related to weave density. However, in the polyester filament fabrics the effect of yarn twist was larger. It seems that an optimum value for both weave density and yarn twist exists to obtain the shear vibration to be continued the longest.