ULTRALITE IS BACK Our lightest weight AEGIS® Strata waterproof fabric has been upgraded for the entire Ultralite range, now with a 20:20k waterproof and breathability rating. This generation (gen II) of AEGIS® Strata fabric is far tougher than its predecessor, giving you added strength and stretch for vigorous movements. 20k Waterproof Rating & 20k Breathability Rating (20,000g/m2/24hrs)