Yeah garaboy .. that`s a Toplace [fullcap] system--I`ve been wearing Toplace for about 2 years or so.... and Toplace densities are heavier compared to some others....... densities vary from one factory/company to another from what I have read [other people`s experiences] I think a picture gives a `ballpark`idea of what a particular density looks like. A TL `medium` is 60-65%..that can be an 80-85% on other suppliers... my 55% is the equivalent of 70% on some other suppliers/makers.....The back of the system is 65% as I think most people`s hair at the back is that bit denser than their sides.The ventilation [direction] is `forward from crown`--- if you intend wearing a similar style, just specify that...it`s handy if you can enclose pics. of a style you`d like to copy/imitate with your order.....and pics of your present state of hair.....this helps get a more accurate match. The main thing is make a template to accurately represent the area needing coverage and to the shape/contour of your head...then a decent stylist to do the cut-in.... John will liaise with you anyway once you send in your template, if you have any last-minute concerns/questions.....send in a good-size hair sample for colour-matching.....about an inch long and the diameter of a pencil....tie it tightly ,like a sheaf of wheat ,with some cotton thread bound around it a few times. Hope that helps..cheers.