Sea to Summit Ultralight XR Insulated Mat

The Sea to Summit Ultralight XR Insulated Mat is a high-performance sleeping mat engineered for ultralight backpackers who demand both minimal weight and reliable insulation. Redesigned to be 14% lighter and 16% warmer than its predecessor, it features 151 Air Sprung Cells that conform to the body for enhanced stability and comfort. ThermalCore insulation with a heat-reflective layer delivers an R-value of 3.6, reducing heat loss in cooler conditions while maintaining a compact pack size. At 6.5cm thick and constructed from durable 30/40D nylon with a TPU laminate, it balances long-term durability with lightweight efficiency, while the included stuff sack doubles as a pump sack for effortless inflation.

Features: 
- 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