# Sea to Summit Ether Light XT Insulated vs Big Agnes Rapide SL Insulated: specs and price compared

A sourced, side-by-side comparison of the Sea to Summit Ether Light XT Insulated (Sea to Summit) and Big Agnes Rapide SL Insulated (Big Agnes) among sleeping pads. Big Agnes Rapide SL Insulated is the cheaper of the two at $169.95.

## Side by side

| Spec | Sea to Summit Ether Light XT Insulated | Big Agnes Rapide SL Insulated |
| --- | --- | --- |
| US price | $199 | $169.95 |
| Brand | Sea to Summit | Big Agnes |
| R value | 3.2 | 4.8 |
| Pad type | air | air |
| Weight grams | 490 | — |
| Thickness (cm) | 10 | 9 |
| Dimensions (cm) | 183 x 55 | — |
| Packed size (cm) | 24 x 11 | — |
| Insulation type | synthetic-fill | reflective-film |
| Inflation type | pump-sack | pump-sack |
| Shell denier | 30 | — |
| Shape | mummy | rectangular |

## Key differences

- R value: Sea to Summit Ether Light XT Insulated 3.2 vs Big Agnes Rapide SL Insulated 4.8
- Thickness (cm): Sea to Summit Ether Light XT Insulated 10 vs Big Agnes Rapide SL Insulated 9
- Insulation type: Sea to Summit Ether Light XT Insulated synthetic-fill vs Big Agnes Rapide SL Insulated reflective-film
- Shape: Sea to Summit Ether Light XT Insulated mummy vs Big Agnes Rapide SL Insulated rectangular

## Sources

- Sea to Summit Ether Light XT Insulated: https://seatosummit.com/pages/ether-light-xt-insulated-sleeping-pad (seatosummit.com, verified 2026-07-11)
- Big Agnes Rapide SL Insulated: https://www.bigagnes.com/products/rapide-sl-insulated (bigagnes.com, verified 2026-07-11)

Canonical: https://frontdeskreview.com/gear/sleeping-pads/sea-to-summit-ether-light-xt-insulated-vs-big-agnes-rapide-sl-insulated/
Cite: Per The Front Desk Review, Sea to Summit Ether Light XT Insulated ($199) vs Big Agnes Rapide SL Insulated ($169.95) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sleeping-pads/sea-to-summit-ether-light-xt-insulated-vs-big-agnes-rapide-sl-insulated/
License: CC BY 4.0.