Protects You in All Weather and All Seasons

In one sense I think these are brilliant - but on the other hand, they do not breath...
However for energency uses and stuck out in the middle of nowhere emergency bedding / accomodation - especially if it's fucking freezing, blowing a fucking gale and icy cold or wet... Brilliant... absolutely brilliant.
IF you have a car to sleep in, and can slit one of these down the side as a under and over blanket in the back seat - fantastic.
Or slitted full lenght sleeping when sitting up in the front seat - pretty fucking good.
Even if it's not horribly icy cold like minus 30*C - they can still be great on a road side stop where you need to sleep for a while and it is pretty cold like 5*C etc...
Get one or get a space blanket....