the present invention relates to a wound covering comprising a sheet of biopolymeric material and a film of a polyurethane resin obtained by reacting a diisocyanate and a random copolymer of tetrahydrofuran and ethylene oxide to produce a urethane prepolymer , and extending the molecular chain of said prepolymer by using a chain extender , said random copolymer containing 20 to 80 % by weight of the ethylene oxide unit in the molecular chain thereof and having a number - average molecular weight of 800 to 3000 . the wound covering of the present invention is excellent in adhesion flexibility , durability , easy handling , preservation , sterile filtration , compatibility with cell , blood starching , water - vapor permeability . therefore , it is quite suitable for practical use .