This windproof jacket was laboratory tested under a shower of 60 litres of water / m² / hour for 3 hours, which corresponds to fine, steady rain or a medium downpour.
This test demonstrates that the water does not pass through either the sealed seams or the fabric. The adjustments and fabrics at the extremities (neck, waistband and cuffs) prevent water getting in while in a static position and greatly reduce it during physical exertion.