Because the two layers can be pressurized independently, the top layer can be inflated to your personal comfort, while maintaining a high-pressure base layer for protection from the rough or uneven terrain. Both layers can be adjusted independently using the fine tune valve to get just the right level of softness and support.
All Sea to Summit air sleeping mats come with a quality stuff sack, a repair kit containing six self-adhesive patches for repairing punctures in the field, and a spare silicone one-way valve flap.