These straps look interesting.
I recently discovered that my Harvest strap, thick, wide, very comfortable, heavy leather, weighs in at 1lb. So my weight limit for a bass wasn't 9.5lbs! I've been carrying 10.5lbs! These are all small margins, but when you have issues, believe me, every ounce counts.
Looks like it is a 1" strap in the middle with 1" of memory foam either side. Does the memory foam support the bass or is it just for padding?