Sea to Summit
Sea to Summit Ether Light XT Insulated
$199
Best Sleeping Pads · head-to-head
Sea to Summit Ether Light XT Insulated vs REI Co-op Helix Insulated
A sourced, side-by-side comparison. REI Co-op Helix Insulated is cheaper at $169. Every spec and price links to its source.
REI Co-op
REI Co-op Helix Insulated
$169Cheaper
Which is better: the Sea to Summit Ether Light XT Insulated or REI Co-op Helix Insulated?
On the specs we track, they're closely matched. The REI Co-op Helix Insulated is the cheaper at $169.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Sea to Summit Ether Light XT Insulated | REI Co-op Helix Insulated |
|---|---|---|
| US price | $199 | $169 |
| Brand | Sea to Summit | REI Co-op |
| Released | — | — |
| 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 |
Sources — Sea to Summit Ether Light XT Insulated: seatosummit.com (verified 2026-07-11). REI Co-op Helix Insulated: rei.com (verified 2026-07-11).
What's the difference between the Sea to Summit Ether Light XT Insulated and REI Co-op Helix Insulated?
Where the two actually differ on the specs we track (4 of 10). Matching specs are omitted.
- 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