The hammock material is made of ripstop Nylon and the webbing is polyester. Originally we were using Polypropylene for the webbing, but decided to switch it up due to the shrink/stretch resistance of the polyester.
We have not sent our hammocks to a lab to be weight tested, so we can't give a definitive number. But we can tell you that we have had 6'3" guys that weigh 230 lay in one comfortably. We have also had couples that combine to be 285lbs lay in it, but not as comfortable as a single person because the hammock funnels everything to the middle and you end up very cozy. Try sleeping head to toe if you get caught in this scenario.
The OG measures 5'4" x 4'.
The XL measures 5'8" x 4' tapered down to 3'.
These measurements may seem small but if you measure diagonally, as you are meant to sleep in them, and take the sag into account, you can fit users up to 6'2" comfortably. After 6'2" you can still manage, but you may have to curl up a bit.