When people place an order they pick the 'style' that they'd like the unit to have. 'Style' is the direction that the hair is ventilated in. So if you want a 'left part' the hair is ventilated or 'knotted' so that the hair points in that direction. By far the most popular choice for style is 'free style' where the hair is vented in no particular direction--it's random. This allows the customer to style it in any way he wants. The styling is noticeable at first but it's not really that big a deal. Why? Because after a few washings and stylings the knots 'turn' in the direction that they're styled. There's nothing that permanently 'fixes' the knotted hair in a certain direction. So the hair 'turns' the way it's styled. So after a few washings and stylings a 'freestyle' could move into a 'left part' or 'right part' or 'comb back' or whatever style is chosen.
Regards,
John