USED purple/pink Dive & Sail wet suit made of 2.5 mm neoprene, warm, stretchy. Provides protection. From sun, abrasions, and jellyfish. Back zipper is in working condition. 

Shark-skin like tummy section  is made of CR neoprene, reducing water resistance and increasing boutancy.  This black section has some abrasions--see photos.

One leg has a rubbed served seam, also in photos, circled in red.

Manufacturer suggests sizing up if between sizes, and also waiting until the suit is wet to judge size.  Dry fitting is more difficult.