The protection layer is the most important in the performance clothing system.

In jackets and trousers if this fails to function the insulation and base layers will absorb moisture.

These outer garments rely on appropriate fabric selection and manufacture but, most importantly, on cut which enables garments to move with the body and to have ventilation and closures which work efficiently.

Maximum waterproofness depends both on material selection and on the position and finish of seams. These factors affect the cut of the garment.