Plush Four-Season Comfort with Extreme Thermal Efficiency

The Sea to Summit Ether Light XR Insulated represents a significant evolution in backcountry sleep technology, designed specifically for those who demand "car camping comfort" in the most frigid conditions. At 10 cm (4 inches) thick, this mat uses the proprietary Air Sprung Cell™ construction, which utilizes many interconnected TPU loops to create larger air pockets. This extra height allows side sleepers to sink in deeply without their hips touching the cold ground, providing a stable and supportive surface that feels more like a traditional mattress than a standard air pad.

What sets the XR (Extreme Range) model apart is the integration of ThermalCore technology. By using multiple layers of quiet, infrared-reflective material, the mat achieves a massive ASTM-tested R-value of 7.4, making it a definitive choice for winter camping, alpine expeditions, and high-altitude treks. Despite its extreme warmth, it remains impressively lightweight and quiet, avoiding the "potato chip bag" noise of other insulated pads. The system is rounded out by the Airstream™ Pump integrated into the stuff sack and the high-airflow XPRESS valve for effortless setup and pack-down, even when wearing gloves.

Key Features:

• 10 cm (4 in) Loft: Provides a plush, supportive sleep surface that is ideal for side sleepers and uneven terrain.
• Extreme 7.4 R-Value: ThermalCore insulation reflects radiant heat back to the user, providing elite warmth for sub-zero winter adventures.
• Air Sprung Cell™ Technology: Looped baffles create a more comfortable, stable surface that conforms to your body shape.
• ThermalCore Insulation: A quiet, multi-layer infrared-reflective system that maximizes heat retention without adding bulk.
• Integrated Airstream™ Pump: The stuff sack doubles as a high-volume pump, allowing for fast, moisture-free inflation.
• PillowLock™ System: Securely attaches your Sea to Summit Aeros™ pillow to the mat, preventing it from slipping during the night.
• Lightweight 30/40D Fabric: A durable yet quiet nylon face fabric that is treated with an antimicrobial TPU to prevent internal mold growth.
• XPRESS Multi-Function Valve: Provides high-airflow for rapid inflation, fine-tuning for pressure, and nearly instant deflation.