However, in many cases, the reported approaches are not appro-priate for the natural fibers especially for protein fibers, as thetreatment temperature was too high for protein fiber that it couldcause a considerable thermal degradation resulting into the yellow-ing, fragile and non-bonded superhydrophobic layer of proteinfibers. An alternative approach is to utilize the chemical reactionon the protein fabrics to form a uniform superhydrophobic layerat a relative low temperature. Hyde et al. increase the water con-tact angle from 0◦to 127◦using atomic layer deposition (ALD) ofAl2O3on cotton at 100◦C [9]. In view of the different structureand chemical groups between cotton and wool fiber, the cotton ishydrophilic and the wool is hydrophobic, thus we considered usingthe atomic layer deposition transformed the hydrophobic surfaceof wool fiber to superhydrophobic. To the best of our knowledge,few studies report the superhydrophobic wool fabric obtained byusing ALD technology.