Snake-proof boots may either be sold specifically as "snake boots" or not, but should be tall, impenetrable to snake teeth, waterproof, and relatively comfortable. Before planning any outdoor excursion where there is grass to obscure snakes, and water to bring in the snake's food supply, wear boots to protect your feet, ankles and lower legs from snake bites.
Snakes are Not Super Monsters
It is important to remember that snakes are not super-creatures capable of biting through steel. So a good leather or man-made material should stop a snake from biting through. You don't have to spend £260 for a pair of specially-designed snake boots to protect yourself or your family. Before purchasing the boots, do a simple check of the upper (the part above the sole). If it seems thick and sturdy, it is relatively safe, and certainly safer than flip flops or sneakers.
Boots and Materials
Not all boots are made of the same materials, so if you have some extra money to spend, look for leather, cowhide or goatskin. Human-made composite materials are also available, and some have a combination of a human-made material stitched to animal skin. A good rule of thumb is to use the ice pick test. If it is difficult to push an icepick through the side of a boot, then it will be difficult for a snake's teeth as well.
Places to Buy
Nearly every clothing store that sells shoes also sells some type of boot, but you should look for an outdoor outfitter for a speciality snake boot. Both traditional brick-and-mortar outlets and online stores sell boots, but you should try on every pair you consider before buying, as every pair of boots fits differently -- even two pair from the same manufacturer.
The Field Test
Put on your boots and take a walk in the outdoors as a field test. If your boots are comfortable (after the "break-in" period), and you feel reasonably safe, these boots should give you an added feeling of protection in any tall, wet grass you encounter.