One size fits most. They are adjustable and will size to almost any foot.
What are they made of?
The body is made of 4-way stretch nylon. The toe is premium grade leather. The sole is made of premium grade suede. All of these materials combine to form the most comfortable, durable, and quiet shoe out there for stalking.
Are they cactus proof?
They are not cactus proof. They will prevent punctures from most stickers, goatheads, and other plant materials. The sole is very strong and will knock the edge off of most sharp surfaces.