Imagine a sleeping mat so comfortable, you forgot you weren't sleeping in your bed at home. With 10cm vertical side walls, and a flat sleeping surface thanks to our Delta Core foam technology, this is as close to a conventional mattress you'll get while still being able to fit other items in your car/van or expedition size pack. With an R-value of 6.5, Comfort Deluxe S.I. Mats can be used in all but the coldest temperatures. Perfect for car camping, or for extended base-camp style trips, the Comfort Deluxe range of sleeping mats will find you the envy of all your friends. All of our S.I. mats use the first ever, multi-function single valve designed specifically for self-inflating mats. No more fighting re-inflation as you try to roll up your mat! Also available in double!