UPDATED FOR 2019 The multi award winning Therm-a-Rest Neo Air reg XTherm 8482 Max is the warmest mattress in the Neo Air range this coupled with its small pack size & lightweight properties makes this mattress ideal for alpinists ultralight backpackers & anyone wanting to get the best level of comfort for the smallest pack size & weight possible Previously Therm-a-Rest added a large speed valve to this model but have decided to take this off for 2019 & revert back to their to save weight to this incredibly popular mat This is the LARGE size & offers extra length & width as well as being the full rectangle version of the XTherm 8482 mattress to offer added coverage & the most fantastic level of warmth & comfort The XTherm 8482 uses multiple reflective Therma Capture 8482 layers for four season warmth has an extra thickness of 6 3cm & now has a new softer textured non-slip fabric outer for a quieter & enhanced night s sleep so it doesn t matter how rough your surroundings are the XTherm 8482 will give you the comfort you need to get a restful night so that you wake up refreshed & raring to continue on your adventure on the following day It s easy to see why this compact mattress with its effective warmth to weight ratio has many accolades to its name including being the winner of the Gold Out Door Industry Award 2011 for its ultra-effective warmth its simply one of the most comfortable warmest & most compact mattresses on the market making it a fantastic choice for anyone getting ready to go on a backpacking exploration Note from the buyer Very comfortable it s great to have the rectangular design & extra width for a change It is unusual to find a sleeping mat which combines comfort small pack size lightweight & warmth There is usually a compromise to be found but with this there is not Therm-a-rest have got it spot on We use ours for lightweight family camping family camping without the aid of a car so it needed to be comfortable enough for a week s use but small & light enough to be carried to a remote campsite Only down side is it s slight rustly noise not enough to cause any real issues though I would not hesitate to take this backpacking as well a real luxury