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Big Agnes

Big Agnes TwisterCane BioFoam (Regular, 183 x 51 cm)

Where it fits

Also works for
Backpacking and wild camping
Not for
Bikepacking, Winter mountain
Why these labels
  • Backpacking and wild camping: Light to carry: 0.4 kg
  • Bikepacking: Bulky for bike bags: packs to 12.1 litres
  • Winter mountain: R-value 1.7: too little insulation on frozen ground

From the maker's stated use and the published specs.

Budget Confidence: Medium
  • Summer wild camp: 4/10 UK, roughly May to September, nights above about 8 °C, sheltered pitches.
  • Three-season hills: 4/10 UK hills in spring and autumn. Wind, rain, and nights near freezing. Below this trip's minimum: needs warmth 5+ (R 3 or more).
  • Winter camp: 3/10 UK winter or high ground. Below freezing, strong wind, possibly snow. Below this trip's minimum: needs warmth 7+ (R 4 or more).
  • Weight: 9/10 How much it adds to your pack, compared with the whole market.

R-value 1.7 (ASTM).

Lowest price we found

£45 at Tiso

In stock. Delivery £3.99. Checked 8 Nov 2026.

RRP £45, checked 19 Oct 2026.

Go to Tiso

Summer wild camps on warm nights, when you want a mat that can't puncture

Valve
no valve
Type
Foam
R-value
1.7 (ASTM)
Weight
397 g (Regular)
Thickness
1.3 cm
Size
183 x 51 cm
Packed
12.1 L

Where to buy

Tiso £45 In stock. Delivery £3.99. Free delivery on orders over £50.

View at shop

Prices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More

Our ratings (out of 10)

1 to 10, compared with the whole market. Each says what it's based on. How we score

Warmth

From maker's figures 2/10

How well it stops the cold ground chilling you. 2: A weak point.

Big Agnes lists R 1.7, under the R 2 line: summer only, or a layer under an air mat. Big Agnes's support page says all its R-values follow ASTM F3340-18.

Thickness

From maker's figures 1/10

How deep it is. Deeper is comfier, above all for side sleepers. 1: A real weak point.

1.3 cm thick.

Quietness

Estimate from maker's specs: foam mats make no noise 8/10

How little it crinkles or squeaks when you turn over. 8: Clearly better than most.

A foam mat makes no noise when you turn over.

Weight

From maker's figures 9/10

How much it adds to your pack. 9: Among the best you can buy for this.

397 g (Tiso's page, copying Big Agnes's figure; Big Agnes's own shop data converts to about 399 g) is under the 400 g line.

Packed size

From maker's figures 1/10

How much room it takes in or on your rucksack. 1: A real weak point.

Big Agnes publishes no packed size. Foam can't compress, so the least it can take up is its flat volume: 183 x 51 x 1.3 = 12,133 cm3, about 12.1 L, in the 7 L+ band. Outdoors Magic says it is not the most packable and straps outside a pack.

What reviewers say (out of 10)

Ratings marked * are from reviews and are not part of the trip score. They are reviewers' scores, not our own measurements. How we score

Comfort*

Estimate: only 2 reviews about comfort (fewer than the 3 we need, so never above 8) 6/10

How comfy it is, including for side sleepers.

2 reviews on comfort, e.g. "Very very thin. Lowest R Value. Least comfortable.".

Reviewers disagree on this.

In short

Good for

  • Summer wild camps on warm nights, when you want a mat that can't puncture
  • A tough layer under an air mat on cold ground or snow
  • A dry seat for breaks and a back-up if an air mat fails

Strengths

  • Cannot puncture or leak, so no repair kit and no pump
  • More than 60% of the EVA foam is sugarcane resin (Big Agnes figure), an unusual choice for a foam mat
  • Smooth side and a tread-pattern side, so you can choose which faces up

Weaknesses

  • Only R 1.7 and 13 mm thick: summer only on its own, and firm on hard ground
  • Bulky: about 12 L rolled, and it has to go outside the pack
  • Reviewers rank comfort low against air and self-inflating mats
  • No packed size published by Big Agnes

Sources

We haven't tested this ourselves. Every score comes from these specs, tests and reviews.

ShowHide sources (7)
  1. Big Agnes: TwisterCane BioFoam Pad product page (US site: size, thickness, R-value) Specs, 19 Oct 2026. Used for: warmth, thickness, weight, packed size
  2. Tiso: TwisterCane BioFoam Sleeping Mat (UK page: 397 g, R 1.7, price) Specs, 19 Oct 2026. Used for: thickness, weight
  3. Adventure Alan: Big Agnes TwisterCane BioFoam Sleeping Pad review Review, 19 Oct 2026. Used for: comfort
  4. Outdoors Magic: Big Agnes TwisterCane BioFoam Sleeping Pad review Review, 29 Oct 2021
  5. Terradrift: Big Agnes TwisterCane BioFoam Pad Review Video, 15 Jun 2021
  6. Big Agnes: Finding the right sleeping pad (lists the TwisterCane at R 1.7 and says all its R-values follow ASTM F3340-18) Specs, 19 Oct 2026. Used for: warmth
  7. Outdoor Life: Best foam sleeping pads (TwisterCane section) Review, 3 Jul 2025. Used for: comfort