Sea to Summit Ether Light XR Insulated review

The Ether Light XR Insulated places third because it is the most cushioned pad we compared, 10 cm (3.94 in.) of Air Sprung Cell construction, with an ASTM-tested 4.1 R-value that Sea to Summit calls extended three-season. ThermalCore insulation with a suspended reflective layer handles warmth. Inflation is simple: the Airstream pump is part of the stuff sack and the XPRESS valve allows fine firmness adjustment and quick deflation. Sea to Summit lists six sizes, from a 66 x 22 in. Small at 15.7 oz to a 78 x 25 in. Large Rectangular at 23.5 oz, and adds PillowLock patches that keep its Aeros pillows from sliding. The price on its US store starts at $189.00 for the Small. Against the NeoAir XLite NXT it trades warmth and weight for cushion: 4.1 R versus 4.5, and 15.7 oz in Small versus 13 oz in Regular. We compared documented features and published prices and did not sleep on the pad.

Who it is for

side sleepers who want a thick, cushioned backpacking pad

Price

$189.00 for the Small size on Sea to Summit's US store as of November 2026.

Ether Light XR Insulated Air Sleeping Pad $189.00
Quoted from the vendor pricing page on November 13, 2026.

Key features

• ASTM-tested R-value of 4.1, extended 3-season
• 10 cm (3.94 in.) thick Air Sprung Cell construction
• Weight 15.7 oz (Small) to 23.5 oz (Large Rectangular)
• Airstream pumpsack integrated into the stuff sack and XPRESS valve
• PillowLock patches hold an Aeros pillow in place

Strengths and weaknesses

• Strength: Thickest pad on the list at 10 cm (3.94 in.)
• Strength: Six sizes, including tapered and rectangular shapes
• Strength: Pump sack doubles as the stuff sack, so nothing extra to carry
• Weakness: 4.1 R-value is below the XLite NXT (4.5) and Rapide SL (4.8)
• Weakness: 15.7 oz in Small is heavier than the 13 oz Regular XLite NXT
• Weakness: $189.00 starting price is for the Small; larger sizes are listed separately

Key facts

• Price: $189.00 (Small)
• R-value: 4.1 (ASTM)
• Weight: 15.7 to 23.5 oz by size
• Thickness: 10 cm (3.94 in.)
• Type: Insulated air pad

Where it ranks

Sea to Summit Ether Light XR Insulated is No. 3 in our Best Sleeping Pads verdict.