Big Agnes Zoom UL Insulated
Backpacking pad
from ~$170

Big Agnes

Big Agnes Zoom UL Insulated

No citable owner-review average published for this one, so no stars.

Big Agnes's lightest insulated pad, and the one that trades the Rapide's cradling rails for four ounces. O-beam internal construction instead of offset I-beams, 3.25 inches of loft, R-value 4.3 and 14.1 ounces in the standard size. The fabric is post-consumer recycled nylon ripstop. It sits directly between an XLite and a Rapide on every axis, which makes it easy to overlook and hard to fault.

from ~$170
3 sizes
R 4.3
ASTM F3340 · Cold three-season
14.1 oz
20 × 72 in
0.30
estimated

What this pad supports

R 4.3 puts it in the cold three-season band — frost, frozen ground, shoulder season. On the pairing table that supports a bag rated to roughly 20 °F comfort before the ground becomes the limiting factor.

Size run

One product, 3 sizes. The headline numbers on this page describe the 20 × 72 in.

SizeWeightApprox. priceLengthWidth
20 × 72 in14.1 oz~$17072 in20 in
25 × 72 in1 lb 1 oz~$21272 in25 in
25 × 78 in1 lb 1.6 oz~$21278 in25 in

Specifications

R 4.3
Cold three-season
0.30 R/oz
14.1 oz
3.25 in
pump sack
72 × 20 in
Two layers of heat-reflective film inside O-beam chambers

Highlights

14.1 ozR-value 4.3

Features

  • Pump sack included
  • Repair kit included
  • Wide option
  • Recycled fabric
  • Under 1 lb

What it does well

  • 14.1 ounces with R-value 4.3 — within a rounding error of the XLite on both counts.
  • 3.25 inches of loft, a quarter-inch more than the XLite.
  • Post-consumer recycled nylon ripstop rather than virgin fabric.
  • Single-port dual-function valve makes micro-adjusting firmness easy at 2 a.m.

What it costs you

  • Loses the offset rails that make the Rapide SL worth buying, for four ounces.
  • The wide sizes jump $42 to $212, which is a steep step.
  • No published face-fabric denier.
  • Only three sizes, and no short version.

Those two lists are drawn from Big Agnes’s published specifications and from reviews that measured them. They are not owner sentiment — anything owners said appears under its own heading below.

What owners say

Distilled from owner discussions and long-term published reviews, not from anything measured here.

The Zoom sits in the shadow of its own stablemate. Owners who have one tend to like it a great deal — one describes it as the most comfortable pad they have slept on — but the pad that comes up more often in Big Agnes discussion is the heavier, cradling Rapide.

One owner observation is worth more than the rest, because it is a direct comparison: someone owning both this and the market-leading ultralight pad in comparable sizes reports the Zoom sleeping slightly colder. That is a small difference and consistent with the published figures, but worth knowing if you are choosing between them on R-value alone.

Beyond that the record is thin, and there is no dressing that up. It is a good pad that not many people are talking about.

What owners like

  • One owner who has slept on a lot of pads calls it the most comfortable they have ever used, which is high praise for a pad this light.
  • Owners comparing it directly with the obvious competitor describe it as similarly specified and a genuine alternative.
  • It shows up paired with roomy side-sleeper bags, which suggests the width works for people who move around.
  • Lighter than the rest of the Big Agnes insulated line while keeping the same 3.25 inches of loft, which owners who care about pack weight point out.

Common complaints

  • Owners who have both it and the market-leading pad in comparable sizes report the Zoom sleeps a little colder.
  • Under-discussed relative to its specification, so there is not much of a reliability picture.
  • The price step to the wide sizes is steep enough that owners mention it.

Questions owners ask

How does it compare with the market-leading ultralight pad?
Similarly specified, and an owner with both in comparable sizes reports the Zoom sleeping slightly colder. The published R-values are close enough that this is consistent rather than surprising. Comfort reports favour the Zoom.
Is it comfortable enough for a side sleeper?
Owner reports are positive — one describes it as the most comfortable pad they have used, and it turns up paired with bags bought specifically for side sleeping. At 3.25 inches it has more loft than most pads at its weight.
Why is it less talked about than the Rapide?
Mostly because the Rapide's cradling outer rails give people something specific to talk about, and because the Zoom is a straightforward good pad without a distinguishing feature. Fewer reports means less known about long-term reliability.

Big Agnes Zoom UL Insulated, head to head

Other pads at this level

More from Big Agnes →
Big Agnes Rapide SL Insulated
from ~$170
Backpacking pad

Big Agnes's offset I-Beam construction puts the larger chambers along the outside edges — 4.25 inches at the rails against 3.5 in the middle — so the pad cradles rather than rolling you off. It is the most useful piece of geometry on any pad here, and combined with R-value 4.8 at 17.9 ounces and a 1.9-litre packed volume it makes the Rapide SL the most complete three-season pad in the catalogue on paper. Six sizes, including a 40-inch-wide version that is effectively a double. Big Agnes names the R-value as third-party rated, which is the correct framing.

1 lb 1.9 oz0.27 R/oz

Best for: Restless sleepers who roll off flat pads

Full spec sheet
Big Agnes Divide Insulated
from ~$110
Backpacking pad

The value entry in Big Agnes's insulated line, and one of the few air pads here that uses real synthetic insulation alongside the reflective film rather than film alone. R-value 4 for $110 is the cheapest insulated air pad in the catalogue, and the 50 × 78-inch version is a proper double for $229. Eight ounces heavier than the Zoom UL for $60 less, which is the whole proposition. Vertical baffles rather than the Rapide's offset rails, which makes for a flatter, less cradling surface.

1 lb 6.4 oz0.18 R/oz

Best for: First insulated pad, or a spare for guests

Full spec sheet
Therm-a-Rest Trail Pro
from ~$160
Backpacking pad

The Trail ProLite with another inch of foam and a soft stretch-knit face, which turns it from a serviceable pad into a comfortable one. Three inches and R-value 4.4 put it level with an XLite on both counts, at half the price and twice the weight — a trade that makes complete sense for weekend trips and none at all for a thru-hike. The knit top is the part people remark on: it does not feel cold or slippery against a bag, and it does not crinkle.

1 lb 14 oz0.15 R/oz

Best for: Weekend backpacking and basecamps where two extra pounds don't decide anything

Full spec sheet