The silver lining is applied to the open cell.
The lycra is just like the nylon, only thinner and stretchier and it's there to ease donning and doffing the suit. The nylon is, well you know what that is from your surfsuits, and the opencell is just the bare rubber and can have, a coating to aid in heat retention ans facillitate donnong and doffing, as with Picasso's Termic lining and OMER and Cressi's metallic linings.
Give Andy a ring at 805.681.2515 or 800.452.6696 and get him one the horn, not one of the flunkies. Tell him I said hi.
sven