A common supersolid low-density skin sliperizing ice and toughening   water surface
  Skins of water and ice share the same attribute of supersolidity characterized by the identical H-O vibration frequency of 3450 cm-1. Molecular undercoordination and inter-electron-pair repulsion shortens the H-O bond and lengthen the O:H nonbond, leading to a dual process of nonbonding electron polarization. This relaxation-polarization process enhances the dipole moment, elasticity,viscosity, thermal stability of these skins with 25% density loss, which is responsible for the hydrophobicity and toughness of water skin and for the slippery of ice. 
Xi Zhang, Yongli Huang, Zengsheng Ma, Yichun Zhou, Weitao Zheng, Ji   Zhou, Chang Q. Sun
physics.chem-ph cond-mat.soft