Those are very heavy duty gaiters!
How big are those snakes?
I have worn gaiters for years
They protect your lower leg against snow and stones in your boots, wet grass, heather and low bracken, and rain with a long poncho or cagoule
What are gaiters?
They are a tube of material that is tied under your boot and hooks on to the front of the boot, they are then tied at the top with a cord.
They can be short just over the ankle or mid calf or all the way up to the knee
My best are 40 years old made of a tough cotton twill, a simple tube put on before the boots
Now they can be heavy nylon packcloth or breathable gortex, with full zips for easy on and off.
Why Gaiters?
Best when worn with breeches, hiking or climbing knickers.
But they work very well with pants
You can heat regulate your legs and cool down or warm up.
Wearing shorts, they protect your lower legs.
In the snow to keep your boots dry
In wet undergrowth they keep the bottom of your pants dry
In bracken and heather they protect your pants from tearing
In rocky ground they stop stones getting in to your boots
When must you have gaiters?
In the snow, they keep the snow out your boots, and keep your feet dry.
The rest of the above benefits are nice but not urgent