Hello Mr Hair. Some people happen to find they can ``get on `` very well with a stock system and are happy with them... It would be impossible to have a myriad of different styles/curl/densities and [most importantly] fit, which could be taken off the shelf and shipped. The stock systems can do nicely to tide you over until a custom system can be made and despatched to you.... human heads are of varying sizes/shapes, obviously, so the stock unit can usually only go `so far` in terms of fit--- I used one last year and found that while the length from front hairline to the back, and from side to side was ok, the perimeter just in front of the crown area tended to pleat up due to the system not being a perfect contour of my head --- don`t expect a stock to give a perfect fit --you might be lucky enough to find that it fits you like a glove, but be aware that it likely won`t, but would tide you over until your custom arrives [if you order one] The pleating of the perimeter means some hair will be standing up from the head rather than flush, and that will have a knock-on effect on the styling--- in most cases, custom is best in the long run. Have a look at the thread further down the page titled `` custom v stock.`` Regards, Paul.