The Cirque is extremely lightweight, waterproof, quiet and breathable. The waterproof/breathable membrane has a 20K waterproof rating and an elite 50K breathability rating. The bonus is the level of 4-way stretch in this fabric, which make the pants even more comfortable. Since RainFlex was introduced in 2006, Sun Mountain has prided themselves in providing the most playable rainwear on the market. Cirque is setting the new bar. Two-year waterproof guarantee.