That's not much protection. People were discussing "snake gaiters" a couple weeks ago -- hard armor gaiters over your calf and boot.

Those are fancy gators! I had a project 30 years ago in snake country. The company would only spring for some hard plastic things that went around your leg up to your knees. I don’t recall disliking them.
As a matter of course I wear regular gators out in the woods to keep thorns from jabbing my shins and crap out of my boots.
Here in Arizona I always wear a full set of 15th-century plate armor. Sure, it gets a bit warm in the sun, but you can’t be too careful about snakes.
Yep Kevlar snake chaps. Mr. GG2 wears them at our rural compound.
I bought some snake boots from Bass Proshop that covered my legs to almost the knee. The manufacturer warranteed the boots and would pay for any medical care when bitten while wearing their boots. They were breathable and you could wear them in water. Great boots.