In reply to Post #2
Is a SIM only suitable for a Sleeping Bag on top?
Any thoughts on using one with a Bedchair Sleep System not having a Sleeping Bag but Duvet layers where you lay directly on top of the SIM?

In reply to Post #31
No. I put my Thermarest between my Duralite and zipped on bag layer. Works perfectly.
I think that's what you're on about?

I have both the Helium 3.8 and Thermarest Trail Pro SIMS ... The thermarest is the better quality SIM with better specification but is more money

In reply to Post #32
My Nash Indulgence doesn't have a zipped on bottom layer to lay on - just the mattress. They have a zip on top layer to lie under.

In reply to Post #1
The one you want is the Mountain Equipment Helium 3.8

I was reading an article on self inflatable mats the other day and it said they should never be left rolled up and they should be kept inflated when not in use or it will damaged the foam cells and they wont self inflate properly if you keep them rolled up. It also said not to blow air into them as it causes bacteria to breed and also damage the foam cells. They suggested leaving them inflated under a bed or behind a wardrobe. Defeats the object of the self inflating aqua mat i just bought mind as i bought it as it was so compact. They never mention having to keep it inflated in the description so thats a bit of a con.

In reply to Post #36
You are correct, storing them rolled up, will shorten the life of the mat.

Although i guess as its a gradual decline I haven't noticed.

In reply to Post #37
As Post#17 I keep mine with a semi lob on