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

The Robens HeatCore 3.8R Regular Sleeping Mat is a lightweight three-season mat for backpackers who need real warmth from the ground without the bulk.

Two layers of foil insulation give an R-value of 3.8 and a quoted lower temperature limit of -9°C, in a 183 x 53cm format that packs to 23 x 8cm and weighs 385g. A greater number of smaller air chambers across the 7cm depth keeps the mat stable and supportive rather than bouncy. The Robens Peak Valve uses one-way technology and high airflow for quick inflation and deflation, a lightweight pump sack is included, and the construction is PFAS-free.

Choose the HeatCore 3.8R Regular when you need more warmth than an uninsulated mat but don't want to carry a winter-weight design.

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 while keeping weight low
• Light and compact – 385g, packing to 23 x 8cm
• Stable and supportive – 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: 183 x 53 x 7cm; packed size 23 x 8cm; weight 385g
• Material: 20D 380T ripstop nylon, TPU coated; colour blue
• Included: HeatCore 3.8R Regular 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 backpackers and campers from spring to autumn, lightweight tourers, and anyone building a compact sleep system for mountain huts and bothies. Suits all experience levels.