Erez,

I had the same problem with my Pygmy Arctic Tern, but I would loose feeling from my thighs down after 20-30 minutes. I removed the Thermarest and put in a piece of 3" thick, 18" long, 16" wide piece of minicell foam in. I sculpted it down to 3/4" thick at the bottom center but left it 3" the front, back, and sides. I sculped it, and sat down, sculpted more, and so on, until I felt no high spots and it was plenty deep. It is as sculpted as any seat I have seen with plenty of thigh support. Before I put it in, I cut the bottom to the shape of the hull. The whole process took about two hours and was ready that same day. Everyone who has tried the seat loves it. It is extremely comfortable and I don't have problems with my feet and legs going to sleep anymore.

Mike

: I use the "therm-a-rest" supplied by pygmy as a seat for my coho.
: It's comfortable, the butt don't ache, but I loose feeling in my feet
: after a while.

: does anyody know WHY it happens ?

: Is it because of the interaction between my body & the seat ?

: or is there some other reason ?

: should I blame the seat ? or should I blame something else ?

: how can I tell if the same problem occur with a different seat before I
: install it ?

: any help appreciated,

: Erez