At 4.25 inches (11 cm) thick with a 7.0 R-value, this is Therm-a-Rest's most comfortable and thermally capable self-inflating pad. StrataCore construction layers thermal foam between alternating ridges of air and foam for a three-dimensional loft that supports your body rather than just cushioning it. Vertical sidewalls maximise the usable sleep surface right to the edges, so you're not losing real estate on the sides the way you would with a tapered pad. The 50D stretch-knit top fabric is genuinely plush against skin and breathes well through the night. Multiple MondoKing 3D pads mate together seamlessly for shared basecamp sleeping arrangements.

The TwinLock valve system uses separate one-way valves for inflation and deflation, inflating three times faster and deflating five times faster than a standard valve. Made in the USA and built for years of reliable use, the MondoKing 3D packs into its included pump stuff sack for transport in a vehicle or storage at home. Available in Large and XXLarge.

• R-value: 7.0 (all-season)
• Thickness: 4.25 inches (11 cm)
• Construction: StrataCore self-inflating foam with vertical sidewalls
• Top fabric: 50D polyester stretch knit
• Bottom fabric: 75D polyester
• Valve: TwinLock (3x faster inflation, 5x faster deflation)
• Large: 25 x 77 in (64 x 196 cm), 4 lbs 6 oz (1.99 kg)
• XXLarge: 30 x 80 in (76 x 203 cm), 5 lbs 8 oz (2.50 kg)
• Mates with other 3D mattresses
• Made in the USA, includes pump stuff sack