Sea to Summit Ether Light XR vs NEMO Tensor All-Season (2026)
Two insulated air pads aimed at three-to-four-season backpacking. Official Regular-class prices are close; the documented trade is thickness and sleeping width versus R-value and packed weight.
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How this page was made: this is a research-based guide built from manufacturer spec and pricing pages and the findings of the reviewers we name and link. We haven’t field-tested these products ourselves, and we don’t give scores. How we pick.
Quick answer
Choose Sea to Summit Ether Light XR Insulated ($189.00) if you want the thicker official Regular pad (3.94 in) and the wider official Regular width (about 21.7 in). Choose NEMO Tensor All-Season ($199.95) if you want the higher official R-value (5.4) and the lighter official Regular Mummy or you will accept 3.5 in of official thickness at $199.95.
Last updated Prices checked Nov 2026
Check Sea to Summit Ether Light XR Insulated price (opens in a new tab)Check NEMO Tensor All-Season price (opens in a new tab)
Key facts at a glance
| Sea to Summit Ether Light XR Insulated | NEMO Tensor All-Season | |
|---|---|---|
| Official price (fetched Nov 10, 2026) | $189.00. CleverHiker listed $199 (Sept 21, 2026). Switchback listed $200 (Sept 1, 2026). Treeline listed $199–$259 depending on size (July 13, 2026) | $199.95. Switchback listed $220 (Sept 1, 2026). Treeline’s July 13, 2026 write-up described the Tensor as about $20 more than the Sea to Summit Regular |
| R-value (official) | 4.1 (ASTM F3340, official page) | 5.4 |
| Thickness | Official 10 cm / 3.94 in. Switchback listed 3.9 in | Official 3.5 in |
| Weight | Official Regular: 470 g / 16.6 oz pad, 525 g / 18.5 oz packed. Switchback listed 1 lb 2.5 oz (18.5 oz). CleverHiker measured a Regular packed kit at 18.7 oz — we report that disagreement with the official 18.5 oz packed figure | Official Regular Mummy: 14.1 oz (400 g) minimum, 1 lb 1 oz (480 g) packed. Official Regular rectangular: 15.5 oz minimum / 1 lb 2 oz packed. Official Regular Wide: 1 lb 3 oz minimum / 1 lb 6 oz packed. Official Long Wide: 1 lb 4 oz minimum / 1 lb 7 oz packed. Switchback listed 14.1 oz. Treeline listed a 14.1–18.0 oz Tensor range |
| Inflated size / shape | Official Regular: 183 × 55 × 10 cm (about 72 × 21.7 × 3.94 in). That official width is wider than the Tensor Regular Mummy’s 20 in | Official Regular Mummy: mummy shape, 3.5 in thick. Our XLite comparison cites the official Regular Mummy outline as 72 × 20 in; confirm the current size table on the product page you buy from |
We compared these pads using Sea to Summit’s official Ether Light XR Insulated page and NEMO’s official Tensor All-Season page, both fetched November 10, 2026, plus CleverHiker’s Ether Light XR review last updated September 21, 2026, Treeline Review’s Ether Light XR review dated July 13, 2026, and Switchback Travel’s Best Backpacking Sleeping Pads of 2026, last updated September 1, 2026. Official Regular-class prices on the pages we fetched were $189.00 (Ether Light XR Regular) and $199.95 (Tensor Regular Mummy). Official R-values are 4.1 (Sea to Summit, ASTM F3340 on the product page) and 5.4 (NEMO). Those are manufacturer ratings, not a test we ran. We have not inflated these pads in the field. Switchback named the Ether Light XR “Most Comfortable for Side Sleepers” and the Tensor All-Season “A Close Second (With a Better Pump Sack)” in that September 1, 2026 roundup. We do not republish numeric scores. This page is not a remake of our NeoAir XLite NXT vs Tensor All-Season comparison; the question here is thickness and width versus warmth-to-weight on two current Regular-class air pads.
Choose the Sea to Summit Ether Light XR Regular if you want the thicker official pad at the lower official price we fetched: $189.00, ASTM F3340 R-value 4.1, 10 cm / 3.94 in thick, official pad weight 470 g / 16.6 oz and packed weight 525 g / 18.5 oz, inflated size 183 × 55 × 10 cm (about 72 × 21.7 × 3.94 in), with an XPRESS valve, Airstream Pump Sack, PillowLock, and a lifetime guarantee advertised on the official product page. Choose the NEMO Tensor All-Season Regular Mummy if you want the warmer, lighter official pad at $199.95: R-5.4, 3.5 in thick, 14.1 oz / 400 g minimum and 1 lb 1 oz / 480 g packed, packed 10.0 × 4.0 in diameter. We have not slept on either pad, and we don’t give scores. Reviewer list prices disagreed with both official pages: CleverHiker (last updated September 21, 2026) listed the Ether Light XR at $199 and weighed a Regular packed kit at 18.7 oz; Switchback’s sleeping-pad roundup (last updated September 1, 2026) listed $200 and 1 lb 2.5 oz (18.5 oz); Treeline Review (July 13, 2026) listed a $199–$259 Ether Light XR size range. Switchback listed the Tensor at $220. We cite the official pages for current list prices and report those disagreements. Compare Regular to Regular Mummy, not a Regular against a Wide.
Sea to Summit Ether Light XR Insulated vs NEMO Tensor All-Season: side-by-side
| Sea to Summit Ether Light XR (Regular) | NEMO Tensor All-Season (Regular Mummy) | |
|---|---|---|
| Official price (fetched Nov 10, 2026) | $189.00. CleverHiker listed $199 (Sept 21, 2026). Switchback listed $200 (Sept 1, 2026). Treeline listed $199–$259 depending on size (July 13, 2026) | $199.95. Switchback listed $220 (Sept 1, 2026). Treeline’s July 13, 2026 write-up described the Tensor as about $20 more than the Sea to Summit Regular |
| R-value (official) | 4.1 (ASTM F3340, official page) | 5.4 |
| Thickness | Official 10 cm / 3.94 in. Switchback listed 3.9 in | Official 3.5 in |
| Weight | Official Regular: 470 g / 16.6 oz pad, 525 g / 18.5 oz packed. Switchback listed 1 lb 2.5 oz (18.5 oz). CleverHiker measured a Regular packed kit at 18.7 oz — we report that disagreement with the official 18.5 oz packed figure | Official Regular Mummy: 14.1 oz (400 g) minimum, 1 lb 1 oz (480 g) packed. Official Regular rectangular: 15.5 oz minimum / 1 lb 2 oz packed. Official Regular Wide: 1 lb 3 oz minimum / 1 lb 6 oz packed. Official Long Wide: 1 lb 4 oz minimum / 1 lb 7 oz packed. Switchback listed 14.1 oz. Treeline listed a 14.1–18.0 oz Tensor range |
| Inflated size / shape | Official Regular: 183 × 55 × 10 cm (about 72 × 21.7 × 3.94 in). That official width is wider than the Tensor Regular Mummy’s 20 in | Official Regular Mummy: mummy shape, 3.5 in thick. Our XLite comparison cites the official Regular Mummy outline as 72 × 20 in; confirm the current size table on the product page you buy from |
| Packed size | Not printed as an inch packed measure on the official block we used; official packed weight is 525 g / 18.5 oz | Official Regular Mummy: 10.0 × 4.0 in diameter (25.5 × 10 cm). Switchback also listed 4 × 10 in |
| Valve / inflation | Official: XPRESS valve and Airstream Pump Sack; PillowLock patches | Official: Laylow micro-adjustable valve and Vortex pump sack. Switchback called the Vortex its favorite pump-sack design in the Sept 1, 2026 roundup |
| Face fabrics (as listed) | Treeline and Switchback both listed 30D / 40D on the Ether Light XR. Confirm the current official materials list on the product page | Official and Switchback: 20D top / 40D bottom nylon |
What are the pros and cons?
Sea to Summit Ether Light XR Insulated: pros
- Lower official Regular price we fetched ($189.00 vs $199.95)
- Thicker official profile (3.94 in vs 3.5 in) and a wider official Regular width (55 cm / about 21.7 in vs the Tensor Regular Mummy’s 20 in)
- Official ASTM F3340 R-4.1, plus an Airstream Pump Sack and PillowLock on the official page
Sea to Summit Ether Light XR Insulated: cons
- Heavier official Regular figures: 16.6 oz pad / 18.5 oz packed vs 14.1 oz minimum / 1 lb 1 oz packed for the Tensor mummy
- Lower official R-value (4.1 vs 5.4)
- Reviewer list prices were $199 or $200, which disagrees with the official $189.00 — confirm the price on the page you buy from
NEMO Tensor All-Season: pros
- Higher official R-value (5.4) and a lighter official Regular Mummy (14.1 oz minimum / 1 lb 1 oz packed)
- Same official $199.95 Regular Mummy price we already use on our XLite comparison
- Official Regular, Regular Wide, and Long Wide options if a mummy outline is not what you want
NEMO Tensor All-Season: cons
- Thinner official profile (3.5 in vs 3.94 in) and a narrower official Regular Mummy width than the Ether Light XR Regular
- Higher official Regular-class price than the Ether Light XR page we fetched
- Switchback listed $220 on September 1, 2026 — we cite the official $199.95 and report that disagreement
Which should you choose: Sea to Summit Ether Light XR Insulated or NEMO Tensor All-Season?
On the official pages we fetched November 10, 2026, the Ether Light XR Regular is the thicker, slightly wider, less expensive pad (R-4.1, 3.94 in, $189.00, 16.6 oz / 18.5 oz packed). The Tensor All-Season Regular Mummy is the warmer, lighter pad (R-5.4, 3.5 in, $199.95, 14.1 oz minimum / 1 lb 1 oz packed). We have not slept on either pad and we do not pick a comfort winner. If you need a rectangular or wide Tensor, use those official size figures, not the Regular Mummy row.
Choose Sea to Summit Ether Light XR Insulated if…
- You want the thicker official Regular pad (3.94 in) and the wider official Regular width (about 21.7 in)
- The official ASTM R-4.1 is enough for your three-season nights
- You prefer the official $189.00 Regular price we fetched, after checking current street price
Choose NEMO Tensor All-Season if…
- You want the higher official R-value (5.4) and the lighter official Regular Mummy
- You will accept 3.5 in of official thickness at $199.95
- You need an official Regular rectangular, Regular Wide, or Long Wide Tensor
Prices and packed weights do not all agree
Sea to Summit’s official Regular price was $189.00 on November 10, 2026. CleverHiker, last updated September 21, 2026, listed $199 and weighed a Regular packed kit at 18.7 oz, 0.2 oz over the official 18.5 oz packed figure. Switchback, last updated September 1, 2026, listed $200 and 1 lb 2.5 oz, which matches the official packed weight. Treeline Review, dated July 13, 2026, listed a $199–$259 range by size and restated the official Regular 16.6 oz pad / 18.5 oz packed figures. NEMO’s official Regular Mummy price was $199.95; Switchback listed $220. We cite the official pages for current list prices and report the reviewer figures separately. We do not merge those prices or invent a “street” average.
Regular is not the same outline on both pads
The official Ether Light XR Regular is 183 × 55 × 10 cm, about 72 × 21.7 in. The official Tensor All-Season Regular Mummy is a mummy outline at 3.5 in thick; official NEMO Regular, Regular Wide, and Long Wide sizes are heavier (15.5 oz, 1 lb 3 oz, and 1 lb 4 oz minimum). Compare the length, width, and shape you will actually buy. A Regular Ether Light XR is not a like-for-like swap with a Tensor Regular Wide.
Who should skip both of these inflatable pads?
- People who want a foam pad that cannot puncture. See our foam vs inflatable guide.
- Campers who need a wide rectangular Tensor and only looked at the Regular Mummy numbers. Use the official Wide figures (Regular Wide 1 lb 3 oz minimum; Long Wide 1 lb 4 oz minimum).
- Anyone treating an official R-value as a sleeping-bag temperature rating. R-value is a pad insulation number, not a “good to X degrees” guarantee we can invent.
- Shoppers comparing this page to our XLite vs Tensor page as if the Ether Light XR replaced the XLite. Those are different official Regular pads with different prices, widths, and R-values.
Frequently asked questions
Which pad is warmer on paper?
Which is lighter?
Do they cost the same?
How thick are they?
Which pad is wider in Regular?
Sources
Prices, specs and land-unit rules were checked on the pages below as of Nov 2026. Brands and land units change prices and rules often, so confirm them on the seller’s or official land-unit page before you buy or go.
- Sea to Summit: Ether Light XR Insulated Air Sleeping Pad official product page (Regular $189.00, ASTM F3340 R-4.1, 10 cm / 3.94 in, Regular 470 g / 16.6 oz pad and 525 g / 18.5 oz packed, 183 × 55 × 10 cm, XPRESS valve, Airstream Pump Sack, PillowLock, lifetime guarantee advertised in the page title; fetched Nov 10, 2026) (seatosummit.com)
- NEMO: Tensor All-Season official product page (Regular Mummy $199.95, R-5.4, 3.5 in, Regular Mummy 14.1 oz / 400 g minimum and 1 lb 1 oz / 480 g packed, packed 10.0 × 4.0 in diameter, plus official Regular / Regular Wide / Long Wide weights; fetched Nov 10, 2026) (nemoequipment.com)
- CleverHiker: Sea to Summit Ether Light XR Insulated Sleeping Pad review (last updated September 21, 2026; $199; Regular measured 18.7 oz packed; compared with the Tensor All-Season; we do not republish numeric scores; fetched Nov 10, 2026) (cleverhiker.com)
- Treeline Review: Sea to Summit Ether Light XR Insulated Air Sleeping Pad review (July 13, 2026; $199–$259 depending on size; official Regular weights restated; Tensor comparison 14.1–18.0 oz, R-5.4, 3.5 in, about $20 more than the Sea to Summit Regular in that write-up; we do not republish scores; fetched Nov 10, 2026) (treelinereview.com)
- Switchback Travel: Best Backpacking Sleeping Pads of 2026 (last updated September 1, 2026; Ether Light XR $200, 1 lb 2.5 oz, 3.9 in, R-4.1, named Most Comfortable for Side Sleepers; Tensor All-Season $220, 14.1 oz, 3.5 in, R-5.4, packed 4 × 10 in; we do not republish scores; fetched Nov 10, 2026) (switchbacktravel.com)
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