soles of rubber or plastics, with uppers of textile material other than vegetable fibers and having outer soles with textile materials having the greatest surface area in contact with the ground, but not taken into account under the terms of additional note U.S. note 5 to chapter 64, with open toes or open heels or of the slip-on type, weighing 10 percent or more of rubber or plastics, valued $15/pr or higher but not more than $30/pr