Sea to Summit Ultralight XR Insulated Air Sleeping Pad

The Sea to Summit Ultralight XR Insulated Air Sleeping Pad is a tapered, three-season backpacking and bikepacking mat built around 151 Air Sprung Cells and ThermalCore reflective insulation, delivering an ASTM F3340-tested R-value of 3.6 at a packed size that fits in the palm of your hand. The mat is available in Small, Regular, and Large to match a range of user heights.

Stable, Supportive Sleep on Uneven Ground

The Ultralight XR Insulated Air Sleeping Pad uses 151 individual Air Sprung Cells arranged across the mat surface. Each cell acts independently, compressing under bony contact points and supporting lighter areas, so the mat conforms to your body rather than forcing your body to conform to it. The mat holds its shape when you shift positions in the night rather than rolling you toward the center. The wider profile (55 cm on Small and Regular, 64 cm on Large) gives side sleepers room to move without hanging off the edge.

Warmth You Can Verify

ThermalCore insulation uses a TRM reflective film layer to redirect body heat back toward the sleeper rather than letting it conduct into the ground. The pad carries an R-value of 3.6, measured under the ASTM F3340 standard, the same independent laboratory test used across the industry. The number is directly comparable to any other ASTM-rated mat rather than a brand-specific estimate, which removes the guesswork from three-season warmth planning when comparing options.

Fast Inflation Without the Headache

The stuff sack doubles as an Airstream pump: one end stows the mat, the other unfolds into a large-volume pump bag that inflates with a single breath and fills the mat in two or three pump cycles. Because the air comes from the bag rather than directly from your lungs, minimal breath moisture enters the mat and there is no dizziness from sustained blowing. The XPRESS Valve integrates a one-way inflate port, a rapid-dump deflate port, and a fine-tune pressure button into a single low-profile unit, so adjusting firmness mid-night or deflating at pack-up takes seconds.

Features

• 151 Air Sprung Cells: independent cells contour to body shape and reduce pressure points for a stable sleeping surface
• ThermalCore TRM Reflective Insulation: reflects body heat to maintain warmth and keeps packed size small
• ASTM F3340-Tested R-Value of 3.6: independently lab-tested for direct comparison across brands
• Integrated Airstream Pump Sack: stuff sack converts to a high-volume pump; inflates the mat in two to three cycles
• XPRESS Valve: single valve handles inflation, fine-tune pressure adjustment, and rapid deflation
• PillowLock System Compatible: included pillow locks secure a compatible Sea to Summit pillow in place through the night
• Liquid-Extruded TPU Lamination: urethane is bonded into the fabric weave rather than rolled on, producing durable, long-lasting welds

Specifications

Who This Is For and Isn't

The Ultralight XR Insulated Air Sleeping Pad suits backpackers, bikepackers, and thru-hikers who need a three-season mat with a verified R-value of 3.6, a sub-500 g weight on Small and Regular, and a packed size small enough for a pack's sleeping-pad sleeve. Side sleepers benefit from the wider profile, and anyone who values a firm, stable surface over a plush feel will find the Air Sprung Cell construction well-matched to their preference.

The Ultralight XR Insulated Air Sleeping Pad is not designed for winter or extreme-cold conditions where an R-value above 3.6 is required. The high-thread-count nylon fabric, once laminated, can produce some contact noise; sleepers sensitive to rustling sounds may want to place a soft layer on top. A compatible Sea to Summit pillow is not included and is sold separately; the PillowLock system secures it once added.

Common Questions

How does the Ultralight XR Insulated Air Sleeping Pad compare to the Ether Light XR?

The Ultralight XR Insulated Air Sleeping Pad is lighter than the Ether Light XR and produces a firmer, more stable sleeping surface. The Ether Light XR has a more plush feel; the Ultralight XR suits sleepers who prefer a supportive, stable platform over a softer one.

Is the R-value independently tested?

The Ultralight XR Insulated Air Sleeping Pad carries an R-value of 3.6, measured under the ASTM F3340 standard, the same independent laboratory test used across the sleeping pad industry. ASTM-tested R-values are directly comparable between brands; mats without ASTM testing rely on brand estimates rather than standardized measurement.

Will the Ultralight XR Insulated Air Sleeping Pad make noise while I sleep?

The smooth, high-thread-count nylon fabric can become somewhat stiff after lamination and may produce some contact noise when you shift positions. Placing a soft layer (a sleeping bag liner or lightweight quilt) on top of the Ultralight XR Insulated Air Sleeping Pad can reduce this.

Which size should I choose?

The Ultralight XR Insulated Air Sleeping Pad is available in three sizes: Small fits users up to 168 cm (66 in) tall and packs to 19 × 10 × 10 cm; Regular fits users up to 183 cm (72 in) and packs to the same footprint; Large fits users up to 198 cm (78 in) and is 64 cm wide versus 55 cm on the smaller two sizes, making it the best option for taller sleepers or those who want extra width.

Does the Ultralight XR Insulated Air Sleeping Pad include a pump?

The Ultralight XR Insulated Air Sleeping Pad includes an Airstream pump sack integrated into the stuff sack. One end of the stuff sack stows the mat; the other unfolds into a large-volume pump bag that inflates with a single breath and fills the mat in two to three pump cycles, with no separate pump required.