Sea to Summit Ultralight XR Insulated Mat

The Sea to Summit Ultralight XR Insulated Mat is designed for ultralight trips where warmth and weight both matter. It improves on the previous model by being lighter and warmer, using 151 Air Sprung Cells that contour to your body for stable, supportive comfort. ThermalCore insulation with a heat-reflective layer gives it an R-value of 3.6, making it a solid choice for cooler nights without extra bulk. With 6.5cm of cushioning, durable 30/40D nylon construction, and a stuff sack that doubles as a pump sack, it’s a practical, trail-ready sleep solution.

Details: 
- 151 Air Sprung Cells provide stable, pressure-point-reducing comfort
- ThermalCore insulation with TRM heat-reflective layer boosts R-value by 16% (ASTM-rated R-value of 3.6 as of 2026)
- 14% lighter and 53% smaller packed volume than previous model
- 30/40D nylon with extruded TPU laminate and Ultrafresh antimicrobial treatment
- XPRESS valve for rapid inflation and deflation
- Integrated pump sack stuff sack eliminates breath moisture
- 6.5cm thickness across all sizes

Technical Specifications: 
- 30/40D hybrid fabric
- Extruded TPU internal laminate
- Ultrafresh antimicrobial treatment
- ThermalCore insulation with TRM reflective layer

Size:
Regular
- Dimensions: 183 × 55 × 6.5cm
- Packed Dimensions: 19 × 10cm
- Weight: 415g

Large
- Dimensions: 198 × 64 × 6.5cm
- Packed Dimensions: 22 × 10.5cm
- Weight: 530g