Robens HeatCore 5.9R Sleeping Mat - Four-Season Insulated Mat

The Robens HeatCore 5.9R Sleeping Mat is a four-season insulated inflatable mat with an R-value of 5.9, built for winter camping and mountaineering where the ground is trying to steal your warmth. Triple foil insulation keeps weight and pack size down, and it comes in Standard and Large.

Multiple reflective foil layers bounce your body heat back at you, which is how the HeatCore gets a strong warmth-to-weight ratio without turning into a bulky roll. Horizontal baffles let the mat settle to your body shape for a stable, supportive platform, and the soft-touch fabric is comfortable against skin while staying durable enough for hard use. The Robens Peak Valve uses one-way technology and high airflow, so inflation is quick and deflation is rapid when it's time to move on.

Choose it when you're camping in sub-zero temperatures or at altitude and a three-season mat won't cut it.

Why you'll love it

• Genuinely warm – R-value of 5.9 for four-season use and sub-zero camps
• Triple foil insulation – strong warmth-to-weight ratio from multiple reflective layers
• Comfortable and stable – horizontal baffles conform to your body shape
• Fast set-up – Peak Valve with one-way technology and high airflow
• Packs small – lightweight design that carries well on backpacking and expedition trips
• PFAS-free – manufactured without intentionally added PFAS

Good to know

• Sizes: Standard and Large
• Materials: polyester, nylon and thermoplastic polyurethane (TPU)
• Soft-touch fabric with durable, outdoor-ready construction
• Included: Robens HeatCore 5.9R Sleeping Mat (Standard or Large) and carry bag

Who it's for

Intermediate and experienced campers, mountaineers and alpine climbers who need a sleeping mat for winter camping, cold-weather trekking, bikepacking and year-round wild camping.