You purchase a single wall tent for its simplicity of set up and the fact that it typically weighs less than a double walled tent of its same category and size.
Single wall tent vs double.
While single wall tents only have one layer a double wall has two layers.
Double wall tents have two layers of protection from the wind and rain.
There could be heavy rain endless snow stifling heat or extreme cold.
Single wall tents only have one layer which is made up of nylon.
They are typically stronger and last longer than single wall tents.
A double wall tent usually has a mesh inner tent with a fly that sits on top to protect you from the elements.
Water proof tent material do not breath well if at all.
Firstly you have the inner tent usually made of durable nylon that is water resistant but not waterproof.
Understanding the difference between single wall and double wall tents the biggest difference lies in the construction of each design.
A rainfly is meant for keeping the rain out of your tent.
Single wall tents are made of one layer of fabric that offers protection against the wind and rain.
Single wall tents are waterproof.
Read about the differences here.
Doubles are made of two layers of fabric typically a breathable inner layer and a waterproof outer layer called a rainfly.
This layer of nylon acts both as a wall and a rainfly.
Single wall tents are easier and quicker to set up which is especially crucial when trying to erect your tent in a blizzard or when having to dig out a ledge on the side of a mountain.
Double wall tents have a rain fly that is separate from the inner tent which is usually a bug net.
Poles support the tent either within inside or outside of the fabric.
Https wildwesttrail co single wall vs double wall tent deciding between a single wall tent or a double wall tent.
A single wall tent has only one layer of fabric this layer provides protection from the elements and is the only walls of the tent.
Single wall tents feature only one layer of nylon acting as both the rainfly and the inner wall.
If that is your foremost concern then a double wall tent is the sensible choice.
Since moisture will not pass through the waterproof layer it collects it.