The Diadem Extreme Mat is a warm, packable and comfortable thermal sleeping mat built for 4-season use and a good night’s sleep on cold ground. We designed it to offer an effective warmth-to-weight ratio for mountaineering, alpine trekking and expedition use all year round. It weighs just 540 grams, measures 183x56 centimetres, and is 6 centimetres thick. It has an insulation rating (R-value) of 4. All this in a mat that packs down to the size of your climbing harness!

This inflating, insulating mattress has a high-quality, 2-way valve for easy inflation and fast deflation. Its tough, durable main material has a robust 30-Denier ripstop construction. What’s more, it uses an internal layer that features a heat-reflective technology to reflect heat emitted by the body for enhanced warmth. And the base is covered in anti-slip material to prevent slipping during the night, so that you sleep and rest more comfortably without cold ground stealing your body heat.

The clever stuff sack doubles up to become a breath-saving pump sack. And in case of emergency, a field repair kit is included.

The Diadem Extreme is our warm, inflating, 4-season insulated sleeping mat.

Tech Specs