Patent ID: 7157028

Claim:
A method of making an insole, comprising the steps of: preparing a mold with a first mold piece and a second mold piece and having a cavity therein, wherein the first mold piece has a plurality of protrusions at a portion of a sidewall of the cavity; injecting a foaming material into the cavity of the mold; stripping the mold to get a piece material with a plurality of pores at a predetermined portion thereof, wherein the piece material has a skin layer on a surface thereof and sidewalls of the pores and the pores form a symmetrical pattern on the piece material; cutting a layer of a side of the piece material off to open ends of the pores; and cutting the piece material to get the insole, wherein included angles between a surface of the protrusions of the first mold piece and the sidewall are in a range between 95 degrees and 115 degrees and a ratio of foaming of the foaming material is over 1.5 times.