Soemone check my math. A precise 3.5" square of their "1.5 oz urethane coated ripstop nylon" weighed 16.5 grains tonight. I'm confident I got an accurate measure. That's 4 frikken oz./sq yd...Rockywoods got some splainin' to do. They also list a shipping weight of 3 oz/yd which is wrong, a lineal yard of this stuff weighs more than twice that.
Their "Waterproof 70D Ripstop Nylon Fabric with Reflective Back - ACU" (looks like its aluminized) comes in at 2.6 oz per yard, which is better than I expected. They only give a shipping weight of 4.5 oz/yd, which...let's see...at 50" width...nope, they're cheating by an oz/yd there, a lineal yadr only weighs 3.6 oz.
I need to have a talk with those guys. My conversations with them have been pleasant and informative, and I get the idea they offer terrific customer service, but these fabric weights need to get cleaned up.