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Robens HeatCore 3.8R Large Sleeping Mat - Three-Season Insulated

The Robens HeatCore 3.8R Large Sleeping Mat gives you three-season warmth and a wider 191 x 61cm platform for 460g. More shoulder and hip room, without a heavy mattress in the pack.

Two layers of foil insulation deliver an R-value of 3.8 and a quoted lower temperature limit of -9°C, which covers UK spring-to-autumn trips comfortably. Rather than a few big tubes, the mat uses numerous smaller air chambers across its 7cm depth, so it feels stable when you roll over. The high-flow Robens Peak Valve and the included pump sack make inflation quick, and it packs down to 25 x 9cm. The construction is PFAS-free.

Choose the Large if you sleep on your side or simply want extra width from a lightweight insulated mat.

Product Details

Colour: Blue
Material: 20D 380T ripstop nylon, TPU coated
Weight: 460g
Dimensions: 191 x 61 x 7cm
Packed dimensions: 25 x 9cm
R-value: 3.8

Why you'll love it

Three-season warmth – R-value 3.8 with a quoted temperature limit of -9°C
Double foil insulation – two layers of foil insulation without unnecessary bulk
Extra room – 191 x 61cm sleeping area
Stable and supportive – numerous smaller air chambers across a 7cm depth
Quick to inflate – high-flow Robens Peak Valve plus a lightweight pump sack
PFAS-free – made without PFAS chemistry

Good to know

Dimensions: 191 x 61 x 7cm; packed size 25 x 9cm; weight 460g
Material: 20D 380T ripstop nylon, TPU coated; colour blue
Included: HeatCore 3.8R Large mat, lightweight pump sack and carry bag
Care: keep the mat away from sharp ground and excessive heat, check the valve and fabric before each trip and follow Robens' care and storage guidance

Who it's for

Three-season campers and backpackers from spring to autumn, especially side sleepers and anyone who wants a wider, comfort-focuséd lightweight setup. Suits all experience levels.