Cocoon VS Sea to Summit
First of all I've not had a chance to test these liners on the road. However, when my wife and I received them we unpacked them, opened them up and tried them on for a test run on our bed.The quality of silk seems very comparable. The S2S does claim that it's rip stop silk the Cocoon does not. Upon inspection the S2S appears a little studier but texture and feel are the same.I'm 6'2 at 230 lbs. and both liners measure within an inch or so of the other. Once inside the room is the same. There was plenty of room for me to move around and the length more that adequate. The built in pillow insert on both is a great idea and seems to perform the same function on both.Now I would like to make some clear distinctions between the two. The Cocoon has a built in side opening down one side with a Velcro closure which makes for easy entry and exit, the S2S does not. The S2S is sewn all the way up. This makes getting into the cocoon a breeze and the S2S a big hassle. Compare it to getting into a sleeping bag where one would zip open 24-36 inches or so on the side and the other had no zipper at all. This should give you the idea.The second key difference is the stuff sacks that come with each liner. The Cocoon has a traditional stuff sack with the spring loaded closure. I was able to stuff the liner back into the sack just like a sleeping bag without folding and also by folding it back into a shape like it came initially. Remember silk is very slick so folding is more like sliding and I believe the stuff it in method is more effective.The S2S comes with a stuff sack that has a two way zipper. I found this not very user friendly. The reason is that one cannot stuff it like the Cocoon so it seems to need the folded approach. Also, once the liner is in, closing the zipper presents a challenge. Not only is it difficult to get it closed even with two zipper pullers but it's very easy to snag the liner in the process. Not very comforting to have ones' $70 liner snag and tear, maybe the rip stop silk will save it, I don't know.In summary, we are sending the S2S back and getting another Cocoon. We'll use them this Summer and after the trip I'll hopefully give an update on the travel worthiness of this product. At this time I would give the Cocoon 4 stars and the S2S a 3 star minus because of the design.
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