So firstly I know this is very light weight which is why they have become popular but it is too fragile to be trustworthy. I got it out of its bag at home and lay it out on a yoga mat and then got in it, I am 70kg and 5ft 9 I was not over dressed but still managed to cause the fabric to rip at the side where it is sewn. I was being careful and so if it is this fragile I don’t expect the material to last very long if you actually need to sleep in it and you were to roll over a couple of times. This could probably be avoided if SOL made them a bit wider so the average sized person can actually roll over it it. I haven’t you’d it outside which O shall be doing next week but at this point I can not really recommend this model. Maybe the version with the zip is a better option.