At a true king single size, it’s designed for solo campers or families who want uncompromising comfort. The 20cm thick open-cell foam, with alternating cut channels, offers premium support, insulation from the cold ground, and unbeatable sleep quality — no matter where you roll out your mat. Engineered for convenience, the 3D20 features side clips to connect two mattresses into a full king bed, plus a generous storage bag that doubles as a pump sack. Whether you're glamping with the family or chasing comfort on your own, the Hexatherm 3D20 brings at-home sleep to the outdoors.