For the design number 2,its a 2 layer design which means the design will be same as the base.If its 17.5cm long of the cords,the 2 strap must be the same so example if the strap 1 is 17.5cm long means the down one is 17.5cm long too.Do you get what i mean?Check again the 2 layer design.Hope to get your reply asap.