5K WATERPROOF - BUT WHAT DOES IT REALLY MEAN?
The HHR (Hydrostatic Head Rating) is the measurement of how much water pressure a piece of fabric can withstand before it starts to seep through. Fabric is placed under a column of water which is 1” in diameter and then 5,000mm of water is added. If the water doesn’t leak through the fabric, then this is rated at 5K. The higher the rating, the more ‘waterproof’ it can be considered. 5K (5,000mm) is sufficient for average to moderate rain on your hike, coastal walk or any decent stint outside in our UK weather. For warmth always layer up, keep moving and head for a pub… or other place of worship.