The Therm-a-Rest MondoKing 3D Self-Inflating Camping Sleeping Pad is designed to provide premium comfort and warmth for camping in any season. With a thick 4.25-inch profile and a soft stretch-knit fabric surface, the pad delivers a supportive, mattress-like feel that helps you sleep comfortably outdoors.

The pad uses the TwinLock valve system, featuring two one-way valves—one for inflation and one for deflation—making setup and packing quick and simple. Its StrataCore construction combines a continuous layer of thermal foam with alternating ridges of air and foam, creating an efficient balance of warmth, comfort, and compressibility.

With an R-value of 7.0, the MondoKing 3D offers excellent insulation for cold conditions. The 3D construction forms vertical sidewalls that maximize the usable sleeping surface and provide a more stable, bed-like sleeping platform.

The pad compresses to a compact 26 × 10.3 inches and packs into the included PFAS-free storage sack for easy transport. For best performance, the self-inflating pad should be topped off with air by breath or the included pump sack and left fully inflated for 2–4 hours before its first use.

The large size measures 77 × 25 × 4.25 inches, rolls to 26 × 10.3 inches for packing, and weighs 4.38 pounds. A stuff sack that also functions as a pump sack is included. The sleeping pad is made in the USA and backed by a limited lifetime warranty.