What is BR1?
BR1 is a MUSTO waterproof rating for fabric that delivers complete protection in a persistent
downpour so you stay dry outdoors.
All of our waterproof fabrics are tested and rated for waterproofness after a minimum of 5 wash
cycles to ensure they are storm proof, even after you have worn and washed them several times.
Waterproofness is determined with a measurement called a hydrostatic waterhead. This is
measured by placing a tube over fabric, pulled tight. The tube is then filled with water until
water begins to leak through the fabric after a 24 hour period. The height of the water column, in
millimetres, is the hydrostatic waterhead measurement.
Even after the fabric has been washed 5 times, BR1 has a minimum hydrostatic waterhead of
5,000mm and up to 10,000mm. This is a significantly higher waterproof rating than the industry
minimum of 1,500mm, and also accommodates for the change in performance when fabric movement
and wind is introduced.
Fabrics with a BR1 rating are also breathable to keep you dry and comfortable. 5,000g of moisture
can pass through the fabric over 24 hours in a controlled test environment, giving it a
breathability rating of 5000g/24hrs.
What are the benefits of BR1?
The fully seam taped construction of MUSTO BR1 rated garments ensures you stay dry and
comfortable even in a downpour so you can enjoy the outdoors in any weather.
KEY BENEFITS OF BR1 RATED FABRIC INCLUDE:
Completely waterproof in persistent downpours
Fully taped seams