Infusion net/mesh is used in resin infusion projects to distribute the resin across and throughout the laminate. The mesh is a 'criss cross' pattern of flexible plastic that facilities resin-flow ensuring that resin reaches all parts of the part.
Infusion mesh can also be used selectively to increase resin flow to certain areas of the mould and increase the speed with which the project infuses. Infusion mesh can be used in multiple layers where even greater resin flow is required.
Like most other elements of the vacuum bagging or resin infusion 'stack' infusion mesh cannot be reused once resin has flown through it and therefore should be considered a disposable consumable of the process.        
This medium mesh is ideal for anything from a small part (like a bonnet scoop) up to and including large parts like full vehicle panels or a wind turbine blade.