AM I WRONG about this flextail zero mattress ?

Flextail says:
A 3.9-inch (10 cm) thick profile and U-shaped high-low structure design, deliver premium backcountry comfort while keeping the weight to a minimum.

https://www.flextail.com/products/zer...

With an impressive R-value of 5.6, ZERO MATTRESS R05 MUMMY adopts a vertical tube structure, which possesses excellent insulation performance, keeping you warm and cozy even in chilly outdoor conditions. Good for year-round, and perfect for outdoor adventures such as backpacking, and hiking.

Weighing just 24.3oz and packing down to φ13*27.5cm/φ5.1*10.8in, ZERO MATTRESS R05 REGULAR is incredibly portable, allowing you to bring luxurious comfort to any campsite or trail. Featuring a user-friendly design, this mattress inflates and deflates quickly with FLEXTAIL ZERO PUMP, allowing you to set up camp in minutes and pack up with ease.


Our Verdict
We're working out what we think about Flextail's R05 Zero Regular Sleeping Mat, we'll add our comments here in due course.

- Reviewed by Ultralight Outdoor Gear


Features
Ultralight comfort
5.6 R-value year-round warmth
Ultra-compact design
Standpipe structure
Easy inflation and deflation
Available in 2 size options

Specifications
Weight: 720g (excluding bag)
Size: 183 x 65 x 7cm / 72 x 25.6 x 2.8in
Packed dimensions: 13 x 27.5cm / 5.1 x 10.8in
Thickness: 10cm / 3.9in
ASTM R-Value: 5.6
Material & Construction
Thermal insulation
7-layer insulation structure
ASTM R-Value:

From 2020, there is a new industry standard for measuring the R-value (level of insulation) of sleeping mats – ASTM F3340-18. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags. You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. In simple terms, the higher the R-value, the warmer the mat.

In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. This will be also be dependent on your sleeping bag, how cold you sleep etc. Please contact our customer service team if you need advice on choosing the right mat for your activity.

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