If you want more room to move without giving up packability, the Sea to Summit Ether Light XR Insulated ASC Sleeping Mat - Grey (Regular Rectangular Wide) is the sweet spot. The rectangular shape adds usable sleep space and suits comfort-focused trips, while 10 cm Air Sprung Cell construction keeps you stable and supported. ThermalCore insulation improves warmth and efficiency, backed by an ASTM-tested R-Value of 4.1 for extended 3-season performance. Inflation is fast with the Airstream pump built into the stuff sack, and the XPRESS valve lets you customise firmness in seconds.

Sea to Summit Ether Light XR Insulated Mat (Regular Rectangular Wide) – Key Features

• Rectangular wide comfort: Extra space for natural movement and comfort-oriented sleep setups.
• ThermalCore insulation: Suspended TRM layer reflects warmth back to the sleeper effectively.
• Extended 3-season warmth: ASTM-tested R-Value of 4.1.
• 10 cm thick support: Air Sprung Cell construction for plush, stable comfort.
• XPRESS valve + pumpsack: Easy inflation, pressure adjustment, and rapid deflation.
• PillowLock compatible: Included patches help keep your pillow secure through the night.

Specifications – Ether Light XR Insulated ASC Sleeping Mat (Regular Rectangular Wide)

• Best Use: Comfort Backpacking, Hunting (Rectangular)
• Comes With: Stuff sack with integrated pumpsack, PillowLock patches, repair kit
• Material(s): 30/40D nylon with TPU lamination, single-layer TRM reflective insulation
• R-Value (ASTM): 4.1
• Thickness: 10 cm (3.9 in)
• Weight: 605 g
• Stuff / Pump Sack Weight: 60 g
• Packed Weight: 665 g
• Packed Size: 24 x 12 x 12 cm
• Fits Up To Height: 183 cm