This premium and insulating Exped Downmat 9 LW is an inflatable down filed mat that has an impressive thickness of 9cm and an R-value of 8 which offers exceptional warmth and comfort ideal for extreme and sub zero temperatures This is the Long Wide version and so offers extra length and width ideal for anyone that needs a little extra room for a comfortable nights sleep Down is both incredibly insulating and highly compressible making this Exped mat warmer and lighter than any comparable mats We really like the integrated pump this is so you can pump up your Downmat without the down filling getting damp from your breath making this an excellent choice for you to get a restful nights sleep in colder conditions