A hydrophobic insulation material includes a fibrous material having fibers with fiber surfaces, and a hydrophobic material on the fiber surfaces. An insulated fabric includes the fibrous material and a fabric, the insulation material being joined to the fabric at a plurality of discontinuous bonding points. The hydrophobic material is advantageously a fluoropolymer, and the f luoropolymer can be applied by submersing the fibers and/or the fabric attached to the fibers in a bath of hydrophobic imparting material. The resulting insulation material has excellent hydrophobic properties.