# Sea to Summit Ether Light XT Insulated vs REI Co-op Helix Insulated: specs and price compared

A sourced, side-by-side comparison of the Sea to Summit Ether Light XT Insulated (Sea to Summit) and REI Co-op Helix Insulated (REI Co-op) among sleeping pads. REI Co-op Helix Insulated is the cheaper of the two at $169.

## Side by side

| Spec | Sea to Summit Ether Light XT Insulated | REI Co-op Helix Insulated |
| --- | --- | --- |
| US price | $199 | $169 |
| Brand | Sea to Summit | REI Co-op |
| R value | 3.2 | 4.9 |
| Pad type | air | air |
| Weight grams | 490 | — |
| Thickness (cm) | 10 | — |
| Dimensions (cm) | 183 x 55 | 182.88 x 50.8 |
| Packed size (cm) | 24 x 11 | 25.4 x 12.7 |
| Insulation type | synthetic-fill | reflective-film |
| Inflation type | pump-sack | pump-sack |
| Shell denier | 30 | 30 |
| Shape | mummy | mummy |

## Key differences

- R value: Sea to Summit Ether Light XT Insulated 3.2 vs REI Co-op Helix Insulated 4.9
- Dimensions (cm): Sea to Summit Ether Light XT Insulated 183 x 55 vs REI Co-op Helix Insulated 182.88 x 50.8
- Packed size (cm): Sea to Summit Ether Light XT Insulated 24 x 11 vs REI Co-op Helix Insulated 25.4 x 12.7
- Insulation type: Sea to Summit Ether Light XT Insulated synthetic-fill vs REI Co-op Helix Insulated reflective-film

## Sources

- Sea to Summit Ether Light XT Insulated: https://seatosummit.com/pages/ether-light-xt-insulated-sleeping-pad (seatosummit.com, verified 2026-07-11)
- REI Co-op Helix Insulated: https://www.rei.com/product/202288/rei-co-op-helix-insulated-air-sleeping-pad (rei.com, verified 2026-07-11)

Canonical: https://frontdeskreview.com/gear/sleeping-pads/sea-to-summit-ether-light-xt-insulated-vs-rei-co-op-helix-insulated/
Cite: Per The Front Desk Review, Sea to Summit Ether Light XT Insulated ($199) vs REI Co-op Helix Insulated ($169) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sleeping-pads/sea-to-summit-ether-light-xt-insulated-vs-rei-co-op-helix-insulated/
License: CC BY 4.0.