Sea to Summit Ultralight XR Isomat R - Arrowwood

With an R-Value of 3.1 (ASTM F3340-18), the Sea to Summit Ultralight XR Insulated Mat R delivers reliable three-season warmth in a remarkably light package. Weighing just 480 g, it packs down to 12 x 23 cm, making it an ideal companion for backpacking and fast-and-light adventures.

Overview

The Ultralight XR Insulated Mat R features a single layer of Air Sprung Cells™ for consistent support and comfort. Its tapered rectangular shape reduces weight without sacrificing sleeping area. The 30D/40D nylon fabric is durable yet soft, and the extrusion TPU lamination ensures long-term air retention. THERMOLITE® and Exkin Platinum® insulation work together to reflect body heat and prevent cold spots, while the multi-function high-flow valve allows for rapid inflation and deflation. An integrated Airstream™ Pump Sack simplifies inflation without introducing moisture into the mat. An anti-microbial treatment helps keep the interior fresh.

What stands out

• R-Value 3.1 for three-season comfort
• Weighs only 480 g and packs to 12 x 23 cm
• Air Sprung Cells™ provide even support
• Tapered rectangular shape reduces weight
• THERMOLITE® and Exkin Platinum® insulation reflect heat
• Multi-function high-flow valve for quick inflation/deflation
• Integrated Airstream™ Pump Sack included
• Anti-microbial treatment prevents internal mold

Technical details

• Inflated dimensions: 183 x 55 cm
• Thickness: 5 cm
• Packed dimensions: 12 x 23 cm (diameter x length)
• Weight: 480 g
• Fabric: 30D/40D nylon
• Insulation: THERMOLITE® and Exkin Platinum®
• Construction: Single layer Air Sprung Cells™
• Lamination: Extrusion TPU
• Valve: Multi-function high-flow
• Pump: Integrated Airstream™ Pump Sack
• Season rating: 3 season
• Colour: Arrowwood
• Included accessories: Stuff sack, repair kit

Our verdict

The Sea to Summit Ultralight XR Insulated Mat R strikes an excellent balance between warmth, weight, and packability. Its 3.1 R-Value and 480 g weight make it a top choice for three-season backpackers who refuse to compromise on comfort.