What is the wall thickness (in millimeters) of the "Slime Super Thick Self Sealing Tube" inner tube.?

That 3.7mm thickness is not the inflated wall thickness- the wall becomes thinner as it inflates and stretches. In addition, it is the molded thickness of BOTH walls added together, making a single wall about 1.8mm thick (uninflated). What would be more interesting to compare is the thickness of a standard tube with a "puncture resistant" version.

I am wondering why you think that wall thickness has anything to do with puncture resistance. Putting aside the knowledge that Slime doesn't work 90% of the time, the large majority of things that can puncture a bicycle tire are easily long enough to go through any tube. That is, ANY tube.

It is much more effective to inspect your tires regularly, get rid of any stuck debris, and maintain the correct pressure.

Oh, if you want to know how I know, it is my job and my profession and my joy... for over 40 years.

In order to have maximum wall thickness, your inner tube has to be as close as possible to the tire size. A thinner wall inner tube that is an almost exact fit to the tire will have thicker walls when inflated than a thicker wall tube that has to stretch to fit the tire size. If you are looking for puncture resistance you should consider using tubeless tires and sealant. Although sealant doesn't work all that well with inner tubes, it is much more effective with tubeless setups

Add me to the "slime doesn't work" team. It only gunges up the valve and pevents any attempts at a real repair with patches and glue. BTDT.

What works, though:

- runnig the tire at the maximum recommended pressure (if the rim stands it - for some modern wide tires, the maximum tire pressure is in fact far above the maximum rim pressure. So far, my rims hold up.)

- use puncture resistant tires (e.g. Schwalbe "plus" series)

- run studded tires, they're almost as good as the Schwalbe "plus" tires - with the downside that, depending on rider weight, the studs work their way inwards through time. Which then requires a liner. Which in turn requires a lot of care to make sure the edges of the liner don't cut up the tube....

Super Thick Tube

Ask the folks who make the product. That's not going to be a well-known spec that cyclists will know.

Doesn't matter. Slime tubes DO NOT WORK.