... for protecting hailstone ,wind, ultraviolet, radiation, and the insects .For example: aphid,lady bug, moth ect. ... the all kinds of vegetables, it is main due to the insects especially the disaster cause by aphid ... inset net prevent the virus disaster way of insects, so it keep the vegetables from damage greatly. Basis ... about 5% higher than the outside, after water it, it can be reach to 10%. To a certain ...