We’ve slashed weight and volume wherever we can with the Ultrasphere 1.5, crafting the definitive sleep mat for when every gram counts. It combines an ultralight fabric with a new weight-saving construction that uses innovative offset air chambers to trap heat within the mat, keeping you warm on wild overnights without the need for bulky insulation. Highly comfortable and supportive, the Ultrasphere 1.5 is the ideal foundation for thru-hiking, summer bikepacking, and multi-day mountain runs.

Astoundingly light at just 310g (size regular).
The new weight-saving construction uses offset air chambers to trap heat and keep you warm.
Comfortable tapered mummy shape that eliminates unnecessary bulk.
Soft, exceptionally lightweight 20D fabric.
When it’s time to pitch for the night, the two-way valve and inflation sack make camp setup quick and easy.
R-value: 1.4.
Thickness: 8cm.
Packed size: 18x9cm.
Roll-away stuff sack with repair kit included.