From the Ostia Collection. With Lagostina's Lagoseal® Plus Base, you can expect improved heat retention and fast heat transfer, thanks to the thick aluminum base encapsulated by a durable stainless steel exterior. Tempered glass lids let you keep an eye on your cooking while it simmers away undisturbed. The Ostia Stainless Steel Cookware set features a straight body shape paired with sleek handles and a flat lid design giving this set a minimalistic look that will blend well with every kitchen.