Separate mug and carafe eliminates over-brewed, muddy coffee produced by most personal French Presses. Split-ring plunger design virtually eliminates coffee "blow-by?" for the most flavourful, mud-free coffee. Nesting, insulated mug includes Sip-It Lid and is made of lightweight, shatter-resistant, BPA-Free Infinity clear polypropylene. Insulating EVA sleeves on mug and carafe remove easily for cleaning.