How we compare sleep gear

Where the specifications come from

Every figure is read off the maker’s own published specification — the spec table on the product page, the per-size weight chart, the fill weight, the girth measurements — and converted into one set of units: ounces for weight, degrees Fahrenheit for temperature, inches for dimensions. That is what lets a Colorado quilt workshop and a Swiss mattress maker share a row without footnotes. 77 source URLs back the 61 entries, and every one is recorded against its item.

Where a maker publishes nothing for a field, the page says “not published” rather than estimating it. That happens more than you would expect: several makers publish no shoulder girth, several publish no fill weight, and 16 of the bags and quilts here publish no lab temperature rating at all.

What every entry records

• ISO comfort and limitthe lab figures, where the maker publishes them — the headline temperature on every bag page
• Rating on the labelthe number in the product's own name, kept alongside so the gap between the two is visible
• ASTM F3340 R-valuethe standardised pad figure adopted industry-wide from 2020
• Fill power and fill weightthe two numbers that multiply into the loft a down item can actually produce
• Weight, per sizethe maker's figure for each size in the run, not just the lightest one
• Shoulder girth and dimensionsfit, which decides more nights than temperature does
• Shell and top fabric denierthe durability compromise, stated in the unit makers actually publish
• Packed size or volumelitres where a maker gives them, because packs are measured in litres
• Approximate price, per sizea snapshot from the maker's own store at the last update

The four numbers we work out ourselves

Everything else on the site is copied. These four are derived, they are labelled as estimates everywhere they appear, and the formula for each is printed on the spec-sheet page as well as here.

Why most entries have no star rating

Stars appear only where a named retailer or a maker’s own store publishes an owner-review average that can be pointed at — 0 of the 61 entries clear that bar today, which is to say almost none of them. The rest simply have no stars. Amazon’s ratings and review counts are never reused here, and no score is ever estimated: an uncited number would be a claim about real customers that nobody could check. That is also why there is no aggregate rating in this site’s structured data.

Where the opinions come from

Two separate things, kept separate on the page. The pros and cons under each product are drawn from the maker’s specifications and from published reviews that measured them — 61 of the 61 entries are marked that way, and those pages say so beneath the lists. Anything owners said appears under its own heading, from owner discussions and long-term reports, and is currently collected for 44 of the 61 entries.

Where no owner discussion has been read, the page says that in as many words rather than leaving a blank. Nothing on this site says “owners report” about a product whose owners nobody here has read.

How the lists are ordered

The catalogue opens sorted by warmth — coldest lab rating first for bags, highest R-value first for pads, with the two never interleaved because the scales are not comparable. Every ranked list prints the rule it sorted by at the top and applies it to the whole catalogue with nothing held back. There are no picks, because picking would imply somebody here tested these.

What this site does not do

No paid placement and no pay-to-rank. No retailer links of any kind — no buy buttons, no affiliate tags, no commission on anything you do after leaving. No invented ratings, no invented owners, no engagement counts. No claim that anything here was tested. Prices are approximate snapshots and are labelled that way everywhere they appear. If any of that ever changes, this page changes first.

Photographs and update cadence

59 of the 61 entries carry a product photograph; the rest show a plain panel with the brand and model number on it rather than a stock image of something else. New models, discontinued ones and price moves are folded in as they happen rather than on a schedule. Catalogue last updated September 2026.