The international situation changed after World War II, favoring the organization of Himalayan expeditions, in spite of the difficult conditions of the Japanese people after the wars end, Japanese alpinists turned their eyes again to the Himalayas. The period of years from the first to the successful expedition coincided with the start of the synthetic fiber manufacturing industry in Japan. During this period, nylon, vinylon and polyester fiber were rapidly developed in this country. It goes without saying that on the basis of the experience of Himalayan expeditions, many improvements were made on synthetic fiber articles for the outdoor sports.
　The optimum properties of textiles for tent that to use Himalayan expedition was studied in this paper. It was suggested that the properties of textile for the tent should ba as follows:
　Weight; max. 135 g/yd²
　Tensile strength (5 cm width) min. 100 kg
　Tearing strength (Trapesoid method) min. 20 kg
　Air permeability (Frazier permeometer) 1-3 ft³/min・ft.

DESCENTE SPORTS SCIENCE Vol.3/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE