I surely cannot be the only one who has retensioned guylines during rain/cold only to have the tent sag further after that.
My last time out, I hiked all day, and pitched my contrail right at dark. Cooked and went to bed, tent nice and taut.
Fast forward a few hours of sleep, rain begins, tent sags. Canted trekking pole raised to upright/plumb, and most of the sag removed, back to sleep.
Few hours later, the tent has sagged further, and is again touching my bag. This time I get to go outside in the dark and rain to retension the thing. I get wet, and risk wetting my bag when I get back in the tent.
By the time I woke at sunrise, the tent was, again, sagging somewhat.
My experiences certainly do not support that one retensioning is all that is required with silnylon in rain. I was less than impressed.
I played around with bungie cord guyouts but found that the spring action made for less than desirable results in wind.
I suppose everyone's mileage may vary, but I think I'm done dealing with silnylon stretch.
I love the design of the contrail, and its' features, but the material selection is proving to be a deal-breaker for me. I'd love to see Henry begin using alternate materials for his tents..