solomission

Have never done any climbing but I do have an MK1 XL and another rig by Integral Designs the Mega Sola which is a large hooped bivy shelter. Both are made of Tegraltex which I have found to be a very breathable fabric. Plus this stuff is a very tough durable fabric. You will not have to baby a shelter made of this stuff.Haven't seen a Bibler tent before but they seem to have a good reputation. Both tents seem very similar. The MK1XL has 2 tunnel vents which aid in ventilation which the Bibler does not appear to have. There is also a full mesh door if needed and I believe these can be ordered with a second door, and a light floor. Mine has a standard floor which like the rest of the tent is tough. I have read that the MK1XL has a better sytem for attaching the poles not only the velcro but the cups in the corners where you put the pole ends are supposed to be better than the Bibler. Again this is just what I've read. I've only used the MK1XL once on the East Coast Trail here in Newfoundland, Canada less than a month ago in about -12 degree tempertures. No condensation or frosty buildup inside the tent. I've used the Mega Sola which is made of the same material, is smaller and has only one tunnel vent year round and have not had condensation problems, so I can vouch for the breathability of these tents, at least in this environment, which is on the east coast, with the Atlantic Ocean crashing away in the background. I've read alot of good things about the MK line of tents and although I haven't put them to the test it's still nice to have top quality gear when you're winter camping. Like I said haven't seen a Bibler but I can vouch for the Integral Designs shelters. The MK1XL sets up in about two minutes weighs less than 5 pounds and is built to last. You can't go wrong with it. Not a bad deal at $550 for a top end mountain tent.