The lightweight Therm-A-Rest Z-Lite Mattress uses all new proprietary foams, placing softer foam on top for increased comfort and denser foam on the bottom for greater durability. The closed cell foam construction does not absorb moisture and is very durable. The Z-ilite folds accordion style for convenient and compact transport. Z-lite sleeping pads provide years of trouble-free, lightweight comfort and performance and is an incredible value to boot. Made in the USA.