Climate adjustable comfort! If you want a lighter and more airy version of the Chelsea Evolution Construction Pant, then choose this model which is constructed in lighter 4-way stretch main material and mechanical ventilation on the side of the knees. Behind the ventilation hides a mesh panel which ensures that dirt does not come in easily and keeps its shape. Under the same zipper, you have the ability to access the knee pads from the outside - making adjustment much easier. We have also added tightening of the leg end with snaps at the base hem of the pant.