With cutting edge Triangular Core Matrixâ„¢ construction and ThermaCaptureâ„¢ ...With cutting edge Triangular Core Matrixâ„¢ construction and ThermaCaptureâ„¢ technology the XTherm NXT delivers a 7.3 R-value while weighing just 439 g (15.5 oz) in the Regular size. Put another way the best warmth-to-weight ratio of any sleeping pad...more