For insulation, oven mitts are padded and designed with heat-resistant material. The interior layers of most oven mitts are made with soft cotton fabrics. Outer layers are made of fabrics that withstand extreme temperatures such as silicon, neoprene, and aramid fibers. Cotton mitts need lots of batting but they can wear down over time if they’re not coated with heat-resistant material. You’ll find many oven mitts with a mix of 100% cotton material and silicone. This combination of fabrics offers great insulation for your hands.