Tychem TK527T - Fully Encapsulating - Level B - Taped Seam (Front Entry) Color: High-Visibility Lime Yellow Fully encapsulated, Level B suit, standard face shield (40 mil PVC), expanded back (accommodates SCBA), elastic wrists, front entry, zipper/PVC zip lock closure, double storm flap over zipper, two exhaust vents, attached boots, outer boot flaps. Fabric Description: Tychem TK - a patented limited-use fabric consisting of multiple barrier films laminated to both sides of a tough substrate material. Tychem TK provides one of the broadest ranges of chemical protection available, successfully tested against more than 260 chemicals. Seam Type: Taped - A very strong seam produced when a sewn seam is covered with a strip of compatible material. The strip is attached by heat-sealing as with film laminated materials. Technical Data ÂDuPont