A flexible strap 34 is looped tight- ly about the tread member 29 medially thereof with the ends forming the loops secured to the strap portion 32 of the band 30 by rivets 35 or equivalent fastening means. in this form the strap 34 is fashioned of woven material impregnated with conductive material such as graphite or carbon for carrying off electrostatic charges from the body of the wearer recei