In setting of contaminated fields in hernia, mesh used is:

The principal advantages of prosthetic meshes are ease of use, relatively low cost, and durability. Biologic meshes are useful in the setting of contaminated or potentially contaminated fields but are very expensive and, based on the most recent evidence, do not offer the durability of permanent prosthetic meshes unless combined with a primary repair Ref: Schwaz's principle of surgery 9th edition, chapter 39.