Don’t know the difference between a fitted sheet and a flat one? Here’s a quick guide on the types of sheets you’ll encounter when shopping for bedding. Fitted SheetsA fitted sheet is designed to fit perfectly onto your mattress. It typically has elastic in the corners to help the sheet grip onto the mattress. Fitted sheets need to be specifically sized to complement the mattress dimensions. If the fitted sheet is too big, the sheet will fall off. If it’s too small, you’ll have trouble getting the elastic over the mattress corners.Flat Bed SheetsAs the name suggests, flat bed sheets are meant to lie flat on the mattress. They should be larger than the mattress surface. The extra fabric that hangs over the sides is then tucked under the mattress.DuvetNot to be confused with a comforter, a duvet is a thick blanket that’s filled with down, feathers, wool, silk, or synthetic material. Duvets require a duvet cover sheet that you can take off to clean. This bedding lies on top of the bed and drapes slightly over the edge of the mattress.Bed SkirtLastly, a bed skirt is a fabric that wraps around the bottom of the mattress. It’s designed to hide the space between the mattress and the floor. This allows you to cover the boxspring and any items that are hiding underneath your bed in storage.