Gossamer Gear Thinlight Foam Pad - 1/8" Review
A 94g closed-cell foam pad built for ultralight versatility — not standalone sleeping. Best used as an inflatable pad companion, sit pad, and pack frame substitute.
Overview
The Gossamer Gear Thinlight 1/8” is not, strictly speaking, a sleeping pad. It’s a 94g (3.3 oz) sheet of closed-cell PE/EVA foam that earns its place in a pack through sheer utility — functioning as an anti-slip layer, inflatable pad protector, sit pad, frameless pack stiffener, and more. As of 2024, GG updated the Thinlight to a new color and a more durable foam formula, making this the best version yet. It’s aimed squarely at ultralight and thru-hiking obsessives who want one item to do the work of several.
Key Specs
| Spec | Detail |
|---|---|
| Weight (Folded) | 94 g / 3.3 oz |
| Weight (Rolled) | 76 g / 2.7 oz |
| Thickness | 1/8” (3 mm) |
| Dimensions (Folded, unrolled) | 73.5”L × 19”W |
| Dimensions (Rolled, unrolled) | 58.7”L × 19”W |
| Packed Size (Folded) | 10.7” × 19” × 1” |
| Packed Size (Rolled) | 19”L × 3” diameter |
| R-Value | ~0.5 (estimated) |
| Material | Polyolefin PE/EVA closed-cell foam, 35 kg/m³ |
| PFAS-Free | Yes |
Performance
Insulation — Know What You’re Getting Into
Let’s clear this up immediately: Gossamer Gear has not formally determined an R-value for the closed-cell foam due to its variable density, but based on thermal conductivity data compiled by an independent scientist, they estimate it at R=0.5 for the 1/8” Thinlight. For context, R=0.5 is pretty low — snow has an R-value of 1, for example. If you’re picturing this as a meaningful insulation booster for a cold night’s sleep, recalibrate. Some people use the Thinlight as a sleeping pad, but that’s inadvisable — it provides very little insulation value by itself or combined with another sleeping pad.
That said, it’s not thermally useless. This is not for cushion and comfort; it’s to stop conductive heat loss. So simple, so light — nothing to break, pop, or leak. One interesting trick circulating on Reddit: placing the CCF pad on top of your inflatable — not underneath — reportedly creates a warmer sleeping environment in cold temps, a method some hikers have used successfully on February AT hikes. Worth experimenting with.
Anti-Slip and Puncture Protection — Where It Really Shines
This is the Thinlight’s killer application. The surfaces of most tent floors and inflatable sleeping pads are relatively slick, and even a slightly inclined campsite can result in the pad sliding around. Placing the Thinlight between the tent floor and the sleeping pad is a simple, foolproof fix — the material acts like sleeping pad cement. It also eliminates the need to apply messy silicone stripes or dots to your tent floor, typically required to prevent pad slip on sloped or uneven pitches.
The Thinlight also protects inflatable pads from punctures caused by sharp rocks or roots. At least one long-term NeoAir UberLite user credits the Thinlight entirely with avoiding any leaks over years of use.
Sitting and Daytime Use
Cushioning is minimal at just 1/8”, bumping up to about 3/4” when fully folded — not enough to make a rock feel like a featherbed, but enough to make bare ground more tolerable for a lunch break or a few hands of cards around the fire. As a closed-cell foam, the pad repels water, making it useful as a sit pad in wet conditions — and if it stops raining while you’re hiking, it’s usually dry by the time you reach camp.
Pack Frame and Gear Utility
The Thinlight is available in a pre-creased folded form so you can use it as a pack frame for a frameless backpack, or as padding for a backpack with a sleeping pad sleeve such as the Gossamer Gear Mariposa 60 or Gorilla 50. The folded version slots directly into a size medium GG pack without trimming. Reddit users also highlight it for “back pad, sit pad, windscreen, yoga mat, anti-slip mat, welcome mat, pad protection, and additional pad insulation” — and that’s not an exhaustive list.
Durability — Handle With Care
The weakest point of the original Thinlight was durability, and it’s still a legitimate concern. After 10 or so days on the trail, users have reported tears when the pad is rolled and strapped to the back of the pack, particularly where it sticks out to the sides and snags on brush or branches. Trailside vegetation can grab the material’s edges and rip it, and if you strap it too tightly, the foam will hold a memory of the strap marks. The 2024 update improved the foam formula, but this is still thin material that needs to live inside a pack pocket or under the lid, not loose on the exterior. One more caution worth noting: the foam has a low melt temperature, so be careful using it as a windshield for your stove.
Pros & Cons
Pros
- Extremely lightweight (76–94 g depending on configuration)
- Versatile enough to replace multiple dedicated items (sit pad, pack frame insert, inflatable protector)
- Closed-cell foam repels water without absorbing it
- Cuts cleanly and easily for torso-length or custom shapes
- PFAS-free material
- Affordable and widely available
- 2024 version features a more durable foam formula
Cons
- R-value of ~0.5 makes it nearly useless as a standalone or meaningful supplemental sleeping pad in cold conditions
- Thin enough to tear on exposed brush, straps, or hardware if not carried carefully
- Minimal cushioning comfort even when folded
- Can take strap impressions if secured too tightly to a pack
- Low melt temperature — keep it away from stoves and open flames
- Cosmetic imperfections (scuffs, air pockets, creases) are common, per GG’s own notes
Who Should Buy This
The Thinlight 1/8” is ideal for anyone pairing it with a quality inflatable pad — especially those running silnylon or DCF shelters where inflatable-pad slip is a real problem, or anyone carrying a puncture-prone ultralight inflatable like the NeoAir UberLite. CleverHiker recommends it for minimalists, backcountry yogis, and backpackers who want to protect and supplement their inflatable sleeping pads. It also fits naturally into frameless pack setups where it can serve double-duty as a back panel. If you’re hoping it’ll meaningfully warm a cold-night sleep system on its own, keep looking.
Verdict
The Gossamer Gear Thinlight 1/8” is one of those pieces of gear whose value only becomes obvious once you actually start using it — and then you wonder why you ever went without it. The R-value is too low to carry as thermal insurance in serious cold, and it’ll lose a fight with a stubborn spruce branch. But as an inflatable-pad companion that eliminates slip, prevents punctures, serves as a sit pad, and stiffens a frameless pack, it earns its 94 grams every single trip. It’s a perplexing mix of simplicity and versatility that is ultralight not only in weight, but also in price. Rating: 7.5/10 — docked for its thermal limitations and durability fragility, but genuinely hard to leave at home.